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/* ======================================================================== * Copyright 1988-2008 University of Washington * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * * ======================================================================== */ Updated: 22 July 2011 imap-2007f fixes a couple bugs. Fix for RFC 4959 Initial Client Response auth failures noted first by MacOSX Lion Mail users. Adjust tcp_open.c:tcp_socket_open to make it a little more useful by adding a write file descriptor test to the select in the case that the open timeout is set. In osdep/unix/env_unix.c:create_path there was a printf that should have been an sprintf. Doesn't matter on modern systems. Updated: 16 December 2008 imap-2007e is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users plus a security fix for users of the RFC822BUFFER routines. Updated: 29 October 2008 imap-2007d is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users plus a security fix for users of tmail or dmail. Updated: 25 March 2008 imap-2007b is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 2 January 2008 imap-2007a is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 20 December 2007 imap-2007 is a release corresponding with the release of Alpine 1.0. The primary focus of the imap-2007 release is bugfixes and reliability improvements. This includes: . fixes to problems discovered between the Alpine 0.99999 pre-release and Alpine 1.0 . fixes to the mix driver to timing race problems uncovered by Timo Sirainen's imaptest suite. imap-2007 using the mix format is believed to pass imaptest completely. A new function, utf8_csvalidmap(), has been added for the benefit of Alpine to use in examining UTF-8 text and determining efficiently whether it can be downgraded to a legacy charset. If you develop an MUA, this may be useful for you too, although you'll have to read the source code to see how to use it. The purpose of the "not-CJK" bit is to prevent messages being downgraded to a CJK charset if all they have in that charset are some special punctuation. Updated: 5 September 2007 imap-2006k is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. The primary focus of this maintenance release is to correct deadlock issues. There were two major causes of the deadlocks: . a change in imap-2006i attempted to resolve a glibc mutex-based deadlock in imapd's signal handler, but ended up worsening the problem. . a bug in the mbx driver, introduced as part of the UIDPLUS work in 2006, applied an mbx-style lock briefly on a traditional UNIX format mailbox. If the traditional UNIX format mailbox was already locked by some other process, the result would be a deadlock of both processes. imapd's signal handling logic is rewritten to avoid the mutex issue, and the mbx driver is fixed so that mbx-style locks are only applied to mbx format mailboxes. imapd now supports the WITHIN extension. Updated: 14 June 2007 imap-2006j is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 5 June 2007 imap-2006i is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. imapd now supports the CHILDREN and ESEARCH extensions. imapd's attempt to return COPYUID/APPENDUID information for a traditional UNIX (and MMDF) format mailbox when the mailbox is open by another process has been declared to be a failure and is now revoked. It was subject to a timing race, loss of which involved an expensive reset of the mailbox's UID regime. Any imapd COPY or APPEND to a traditional UNIX or MMDF format that is open by some other process will now no longer return COPYUID/APPEND. Although this is technically in violation of RFC 4315, there is a loophole in that document and the timing race/performance problem is worse. Updated: 4 April 2007 imap-2006h is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 30 March 2007 imap-2006g is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 30 January 2007 imap-2006f is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. For the benefit of multi-threaded applications, use of strtok() has been abolished in the c-client library. imapd and ipop3d stuff use it though. The TOPS-20 and VAX/VMS ports still use strtok() since they don't use UNIX threads. This version has been test-built on Linux, Mac OS X, NeXT, Windows XP, TOPS-20, and VAX/VMS. This will probably be the last test-build on VAX/VMS since the system I use for that purpose is being shut down. I have no way to test-build on DOS, legacy Mac OS (OS 9 and earlier), OS/2, or Windows CE; and the builds on those systems are probably broken. Updated: 26 January 2007 imap-2006e is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. Updated: 6 December 2006 imap-2006d is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. The decomposition mapping, title-case mapping, and character widths tables have been updated to comply with the Unicode 5.0 standard. Prototypes for the utf8aux.c functions have been moved to a new utf8aux.h. The general c-client modules now include c-client.h instead of the individual files. Use of c-client.h instead of individual include files insulates against future shuffling of include files. Updated: 23 October 2006 imap-2006c is a maintenance release, consisting primarily of bugfixes to problems discovered in the release that affected a small number of users. By popular request, if a user has a mix (or other dual-use) format INBOX, it will no longer be listed as \NoInferiors. It's a bad idea to depend upon this due to the case ambiguity issue, but it's there. Updated: 26 September 2006 imap-2006b is a maintenance release, consisting entirely of bugfixes to problems discovered in the release that affected a small number of users. Updated: 15 September 2006 imap-2006a is a maintenance release, consisting entirely of bugfixes to problems discovered in the release that affected a small number of users. If it is necessary to build IPv4-only on one of the ports that has IPv6 preconfigured (ldb, lfd, lmd, lrh, lsu, osx, oxp), this can be done by using IP6=4. You can't do IP=4 in the build command directly since these ports set IP themselves; however, now instead of setting IP=6 they now set IP=$(IP6). Updated: 30 August 2006 imap-2006 is a major release. Programs written for imap-2004g should build with this version with minor or no modification. imap-2005 was not released except as development snapshots. imap-2006 contains major extensions to its Unicode support. Searching and sorting are now done with strings canonicalized to titlecase and decomposed form. Among other things, this means that Latin letters with diacriticals will now sort with the basic Latin letter, and case-independent searching of such letters (e.g., German umlauts) now works. Previously, sorting was done strictly by Unicode codepoint, and case-independence only worked with ASCII. imapd now supports the UIDPLUS extension for mailboxes in unix, mmdf, mbx, mx, and mix formats. UID EXPUNGE is fully implemented. Note that UIDPLUS is not supported in the little-used drivers (mh, mtx, tenex) in which meaningful APPENDUID/COPYUID data can not be returned. Refer to bugs.txt for more details. The new mix format is a dual-use mailbox format designed for performance and reliability with large mailboxes. mix is documented in file mixfmt.txt. SSL/TLS certificate validation on UNIX now checks the alternative names in the certificate if the CN does not match. The new /tls-sslv23 flag in a mailbox name causes a TLS session to use the (incorrect) SSLv23 client method instead of the TLSv1 client method. Some broken servers use the SSLv23 server method, and this flag works around that problem. WARNING: use of this flag will cause TLS negotiation to fail with a server which uses the proper TLSv1 server method. Additionally, there are known security risks in SSLv2; so users should be suspicious if this switch suddenly becomes necesary. The silly mailbox flag combination /ssl/tls is now rejected as an invalid remote specification. Previous versions tried to negotiate TLS over an SSL session; even if the server permitted such a thing it couldn't work. The memory management of several drivers has been redesigned to consume less memory and hopefully be faster. The private.data member of the MESSAGECACHE (elt) has been replaced with a union that contains private.spare.data and private.spare.ptr, the latter being a pointer. A new FT_RETURNSTRINGSTRUCT flag has been added for mail_fetch_body() and mail_fetch_text() calls. If this flag is set, *and* if the function returns NIL, then the requested string data is available on a stringstruct on stream->private.string. This is a special hack for the IMAP and POP servers and is subject to incompatible change. The result is a major performance improvement in the servers with the mbx driver, particularly with large messages. Updated: 15 September 2005 imap-2004g is a maintenance release, and consists solely of a bugfix to quoted string handling in the mailbox name parsing routine. Updated: 15 August 2005 imap-2004f is a maintenance release, and consists solely of a bugfix to the TCP code. Also included is a new version of the UNIX SSL/TLS routines that allows the SSL/TLS certificate validation client code to validate alternative names in server certificates. This code has not been thoroughly regression-tested but is believed to work. To use this new code instead of the old support: cd imap-2004f/src/osdep/unix mv ssl_unix.c ssl_unix.old mv ssl_unix.new ssl_unix.c Then rebuild. Updated: 21 June 2005 imap-2004e is a maintenance release, consisting entirely of bugfixes. There are no user-visible functional enhancements in this version. Updated: 20 April 2005 imap-2004d is a maintenance release, released concurrently with Pine 4.63, and consists primarily of bugfixes There is now a workaround for RedHat breaking flock(). However, since RedHat has said that they don't support flock(), there is no guarantee that they won't break it in the future. So you may want to consider some other Linux distribution or BSD instead. See: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=123415 for the gruesome details. There are no user-visible functional enhancements in this version. Updated: 18 January 2005 imap-2004c is a maintenance release, released concurrently with Pine 4.62, including fixes to quoted-printable encoding and CRAM-MD5 authentication. NNTP proxy in imapd now supports the LIST and LSUB commands. There are no other user-visible functional enhancements in this version. Updated: 29 November 2004 imap-2004b is a maintenance release, consisting primarily of bugfixes. Programs written for imap-2004a will build with this version without modifification. There are new ports for Solaris with Blastwave Community Open Source Software (gcs) and Mandrake Linux (lmd). SET_SNARFINTERVAL now controls how frequently local drivers will move new mail from the mail spool as well as from a maildrop. Maildrops are still tied to a minimum interval of 1 minute, but there is now no minimum for the spool file. Character set conversions now map non-breaking space to space if the destination character set doesn't have nbsp. JIS Roman yen sign is now mapped to Unicode yen sign. There are no user-visible functional enhancements in this version. Updated: 8 July 2004 imap-2004a is a maintenance release, consisting primarily of critical bugfixes. Programs written for imap-2004 will build with this version without modification. imapd now has a supported NNTP proxy capability. If the file /etc/imapd.nntp exists, the contents of that file are used as the host name of an NNTP server which will be used whenever a #news. name is used. For example, if /etc/imapd.nntp contains nntp.example.com, and the IMAP client SELECTs or EXAMINEs the name #news.comp.mail.imap, what will actually be opened in imapd is {nntp.example.com/nntp}comp.mail.imap The OSF/1 port (Digital UNIX, Tru64) now uses flocksim instead of flcksafe. Some cretin decided to delete the winning flock() call and make flock() use the losing fcntl() call instead. The unix[nt] and mmdf drivers now prevent mail_append() from writing Status:, X-Status:, X-UID, X-IMAP[base]:, and X-Keywords: header lines to a traditional UNIX or MMDF format mailbox. If any such lines are in the text supplied to mail_append(), they will be quoted by prefixing with "X-Original-" (e.g. Status: will become X-Original-Status:). There are no user-visible functional enhancements in this version. Updated: 10 May 2004 imap-2004 is a major release. Programs written for imap-2002e should build with this version with minor modification. imap-2003 was not released except as development snapshots. mailutil has three new commands: delete, rename, and prune. IPv6 support now exists for UNIX and W2K. It is the default in W2K builds. On UNIX, add "IP=6" to the make command line. Windows IPv6 support is only for W2K builds. The NNTP driver now supports NNTP SASL and TLS. The ldb (Debian) and lrh (RedHat) ports now look for mlock on /usr/sbin/mlock instead of /etc/mlock. imapd now supports the LITERAL+ and SASL-IR initial-response extensions. The IMAP driver has some additional checks to reduce the amount of network traffic, including executing "silly searches" (searches of sequence numbers only) locally. The IMAP, POP, SMTP, and NNTP drivers now have diagnostic code to provide better information about servers which violate SASL's empty challenge requirements (e.g. with the PLAIN mechanism). There is a new mail_fetch_overview_sequence() function which is like mail_fetch_overview() but takes a sequence number string as an argument. There should have been a flags argument and FT_UID bit as in all the other mail_fetch_???() functions but compatibility with the past... :-( The overview_t callback (from mail_fetch_overview()) now has a fourth argument which contains the message sequence number (as opposed to the UID which is in the second argument). It turned out that some applications were calling mail_msgno() (which can be moderately expensive) to get the sequence number, and c-client already knew it. Many declarations which are completely internal to a driver have been removed from the driver .h file, and in those cases where there are no external declarations left the .h file has been eliminated entirely. As part of this, the mbox driver routines are now incorporated with the unix driver routines as opposed to being a separate file. The mbox driver still needs to be lunk in order to get the mbox functionality. Updated: 27 August 2003 imap-2002e is a minor release, released concurrently with Pine 4.58, and contains primarily bugfixes. Programs written for imap-2002d will build with this version without modification. The NNTP client code now tries to perform better with legacy NNTP servers which do not comply with the current NNTP protocol specification draft, most notably Netscape Collabra. Delivery notifications now work reliably with SMTP servers that support it. The following changes are primarily of concern to developers and power users: There is a "limited advertise" option in env_unix.c which, if set, will only advertise the user's own namespace and the #shared/ namespace. It is now possible to build the IMAP toolkit with a separate SSL KEY file from the certificate file (SSLKEYS vs. SSLCERTS). A new BODY structure element, sparep, is available for the main program to use as a pointer for its own purposes; as well as a SET_FREEBODYSPAREP function, similar to SET_FREEENVELOPESPAREP, SET_FREEELTSPAREP, etc. Updated: 28 May 2003 imap-2002d is a minor release, released concurrently with Pine 4.56, and contains primarily bugfixes. Programs written for imap-2002 should build with this version without modification, with one exception. That exception is the ngbogus envelope flag, which stopped being used in imap-2002c and is now gone for good. The NNTP newsgroup listing code now tries to use wildmats on the NNTP server, which should result in better performance especially on slow lines. It is also once again permitted to log in on NNTP servers when /loser is set. imapd now supports the UNSELECT command. A new envelope flag, imapenvonly, indicates that the envelope in a MESSAGE/RFC822 BODY structure only has the IMAP envelope components and not the additional components from c-client: Newsgroups, Followup-To, and References. Updated: 7 April 2003 imap-2002c is a minor release, released concurrently with Pine 4.55, and contains primarily bugfixes. Programs written for imap-2002 will build with this version without modification. The POP3 driver will, with new servers that support CAPA, use the LIST command to get the elt->rfc822_size and the TOP command to get the message header, instead of fetching the entire message. Note that it is a bad idea to do this with old servers, since they may misimplement LIST and TOP. The result is a substantial performance improvement. Subject extraction for comparisons in SORT and THREAD are now done in full compliance with the rules laid out in the specification. This only makes a difference if "re:" was part of a MIME quoted-word. The new experimental #move namespace allows download-and-delete from a source mailbox to a destination mailbox. Immediately following #move is a delimiter character which must not appear in the source mailbox name, then the source mailbox name, then the delimiter again, then the destination mailbox name. For example: #move+{pop3.foo.com/pop3}+INBOX will download messages from "pop3.foo.com" into your local INBOX. The NNTP driver now uses the LIST EXTENSIONS command as described in the current NNTP protocol specification draft, and will prefer to use OVER over XOVER, HDR over XHDR, etc. The SET_NNTPRANGE function of mail_parameters() can be used to limit the number of articles recognized by the NNTP driver, resulting in a substantial performance improvement with NNTP servers that may have hundreds of thousands of old articles in the spool. If set non-zero, then only the last n article numbers will be considered. If you are on a slow link, you may want to set this to 1000 or less. Besides the normally tested UNIX and 32-bit Microsoft platforms, this release has also been tested and will once build under TOPS-20 and VAX/VMS. I also fixed a bug which would keep it from building on 16-bit DOS, but I don't know if it will build on that platform or not since I no longer have a system with the old DOS C compiler. It has not been tested on Macintosh (note however that Mac OS X is a type of UNIX and should build), Amiga, or OS/2, and probably no longer builds on those platforms. Updated: 7 January 2003 imap-2002b is a maintenace release, released concurrently with Pine 4.52, and contains only bugfixes. Programs written for imap-2002 will build with this version without modification. Drivers which do not announce new mail are now indicated by the DR_NONEWMAIL driver flag. Driver which do not announce new mail when read-only are now indicated by the DR_NONEWMAILRONLY flag. There are no user-visible functional enhancements in this version. Updated: 10 December 2002 imap-2002a is a maintenance release, consisting entirely of critical bugfixes. Programs written for imap-2002 will build with this version without modification. There are no functional enhancements in this version. Updated: 28 October 2002 imap-2002 is a major release. Programs written for imap-2001 will probably build with this version without modification, with one exception. That exception is if the program uses [GS]ET_DISABLEAUTOMATICSHAREDNAMESPACES, which has been renamed to [GS]ET_DISABLEAUTOSHAREDNS in order to placate some compilers which don't like very long names. SSLTYPE=nopwd is now the default, in accordance with current IESG security requirements. In order to build the IMAP toolkit without SSL/TLS you must now use SSLTYPE=none. At initial build time, you will be told if the SSLTYPE setting is in compliance with IESG security requirements, and if it is not you will be asked to confirm to continue the build. ORDEREDSUBJECT threading has been changed in accordance with draft 12 of the IMAP threading specification. Previously, each non-root message in an ORDEREDSUBJECT thread has been a child of the message immediately preceeding it in the thread. Draft 12 changes this so that the second message in the thread is the child of the first (root) message, and all subsequent messages are siblings of the first message. This is significant in MUAs which display the thread structure graphically; the new definition is much saner than the old one since it does not nest endlessly due to parent/child relationships that may not exist. This also impacts imapd, since imapd's THREAD command will return a thread structure. RFC 1730 server support, which was disabled in imap-2001, is now fully removed from imapd. imapd still supports IMAP2bis, specifically the FIND command, since there are still a few IMAP2 clients out there. The IMAP client routines in the c-client library continue to support recognize RFC 1730 servers, but do not implement the deprecated features of RFC 1730. The Frequently Asked Questions file is now in HTML format, although a text version (generated from the HTML version with Lynx) is also provided. A new program, mailutil, is now bundled with the IMAP toolkit. mailutil replaces the old chkmail, imapcopy, imapmove, imapxfer, mbxcopy, mbxcreat, and mbxcvt programs that were distributed in the imap-utils. In addition, the tmail, dmail, and mlock programs from the imap-utils are now also bundled with the IMAP toolkit. In addition to the usual bugfixes, the following c-client functionalities are new in imap-2002: The SET_DISABLE822TZTEXT parameter allows a client to suppress generation of the "human friendly" time zone text in RFC822 dates. This placates netnews and some broken SMTP servers which think that long timezone names from Windows are an attempt at a buffer overflow attack. The restrictBox option in env_unix.c sets "restricted box" functionality, which disables access to the root (leading "/"), access to other user's directories (leading "~"), and access to superior directories via "..". Content-Location is now supported by the "location" member of the BODY structure. Note that there is a bug in the IMAP client code in older versions of the c-client library that causes it to handle BODYSTRUCTURE extension data improperly if that data is a literal. The new functionality for Content-Location may trigger this bug. The fix is either to upgrade the IMAP client program to the imap-2002 version of c-client or to remove the Content-Location support from imapd. There are now 8 spare bits for application use in both the elts and the mail streams. mail_search() now returns a value (previously it was void). If mail_search() returns NIL, then the supplied charset was invalid or the IMAP server returned NO (probably because the supplied charset was invalid). New utf8_charset() routine to look up a charset and return c-client's database about that charset if found. Among other things, this will give you the scripts supported by that charset and its Unicode conversion table. New FT_NOLOOKAHEAD flag for mail_fetch_structure() disables fetching of any envelopes other than the one specified. Otherwise, it will try to do anticipatory fetching (up to IMAPLOOKAHEAD). New GET_FETCHLOOKAHEAD allows better control of mail_fetch_structure() lookahead. Instead of looking IMAPLOOKAHEAD messages forward from the specified message, it will use a supplied SEARCHSET to generate message sequences and ranges. It will stop at IMAPLOOKAHEAD messages or at the completion of a range which exceeds IMAPLOOKAHEAD. The search set only applies to the next mail_fetch_structure() on that stream, and is cleared once it is used. Call with SEARCHSET **set = (SEARCHSET **) mail_parameters (stream,GET_FETCHLOOKAHEAD,(void *) stream); *set = pointer to desired search set New mail_shortdate() routine returns an date in the format expected by SEARCHPGMs. Updated: 2 November 2001 imap-2001a is a maintenance release, consisting primarily of bugfixes including some critical bugfixes to crash and denial of service problems. Programs written for imap-2001 will build with this version without modification. The following new facilities have also been added: The new /norsh switch in mailbox names provides a more intuitive way of disabling rsh-IMAP than the existing :143 or setting the rsh-timeout to 0. Passwords are no longer returned in mm_dlog() callbacks unless the application sets the SET_DEBUGSENSITIVE parameter. The SET_NETFSSTATBUG parameter allows an application to force the traditional UNIX mailbox driver to close and reopen the mailbox at ping time. This is EXTREMELY inefficient, and should only be used to access files stored on AFS and old NFS systems. The ISO 8859 and Windows conversion tables have been updated to comply with Unicode 3.1, and the KOI8-R table has been verified as compliant with Unicode 3.1. The SPECIALS mechanism for passing parameters to the lowest level Makefile has been updated to be more general. See the next item for why you might care. New lrh port to build on Red Hat Linux 7.2, with pre-set definitions for the places where Red Hat has placed Kerberos and SSL. It's actually just the lnp port with SPECIALS defined accordingly. You may want to use it as a model if your system needs such definitions. Note that SPECIALS is primarily for IMAP toolkit (and Pine) purposes, and that user settings should use EXTRASPECIALS instead. Updated: 22 June 2001 imap-2001 is a major release. Programs written for imap-2000 will probably build with this version without modification. The FAQ document has been significantly expanded. Be sure to read it for more information. In addition to the usual bugfixes, the following features are new in imap-2001: SSL is now fully integrated into the IMAP toolkit; the old "alt" kludges to be able to produce a "sanitized" version of the IMAP toolkit to comply with late unlamented US export regulations are now completely gone. Full client and server TLS support is also in this release. The server certificate must be signed by a trusted certificate authority and the name in the certificate match the user's entry for the server host name; this means that the user must enter a fully-qualified host name. To build with SSL/TLS on UNIX, you now use "SSLTYPE=unix" instead of the former "SPECIALAUTHENTICATORS=ssl". To build with SSL/TLS on UNIX and disable the use of plaintext passwords except when under SSL/TLS, use "SSLTYPE=nopwd" instead of "SSLTYPE=unix". RFC 1730 (IMAP4 as opposed to IMAP4rev1) support is turned off by default in imapd. No clients should still be using RFC 1730 protocol. Look at the imapd Makefile for how to re-enable RFC 1730 support. Note that this code may be removed in the future, so if you think you need it you had better let me know. There are some new options (turned off by default) which attempt to work around problems in certain clients. See the FAQ file for more details. Updated: 24 January 2001 imap-2000c is a maintenance release, consisting primarily of bugfixes. Updated: 9 January 2001 imap-2000b is a maintenance release, consisting primarily of bugfixes. Updated: 9 November 2000 imap-2000a is a maintenance release, consisting primarily of bugfixes. Updated: 19 September 2000 imap-2000 is a major release. There are major internal and external changes from earlier versions (imap-4.x and imap-3.x series). Programs written for imap-4.x will probably build with this version without modification. It is extremely unlikely that a program written for imap-3.x or earlier series will build with this version without modifications. Drivers written for earlier versions will definitely need to be rewritten. In addition to the usual bugfixes, the following features are new in imap-2000: SSL support is now available. For UNIX, it is necessary to install some version of OpenSSL; see imap-2000/docs/SSLBUILD for more information. SSL support is now automatic for the NT, NTK, and W2K ports. SSL use is indicated by the /ssl switch in the mailbox name. With SSL connections, the server certificate is validated by the client code on UNIX, and Windows 2000 unless /novalidate-cert is specified. Server certificates are currently is not validated on Windows 9x, Windows Millenium, or Windows NT 4; this is an artifact of the operating system and not the port (e.g. client code using the NT port will validate certificates if running on Windows 2000). On UNIX, the server certificate must be signed by a trusted certificate authority. On Windows 2000, the certificate must be signed by a trusted certificate authority and match the user's entry for the server host name; this means that the user must enter a fully-qualified host name. Calendar reclama for the benefit of old broken non-Y2K compliant software. Two digit years from 00 to 69 will be interpreted as 2000 through 2069. In addition, three digit years from 100 to 105 will be interpreted as 2000 through 2005. Support for REFERENCES threading (in addition to the previously-existing ORDEREDSUBJECT threading). Support for the IMAP MULTIAPPEND extension. This allows much faster uploading of multiple messages to an IMAP server. Support for the LOGINDISABLED IMAP capability. If the IMAP server sends LOGINDISABLED as a capability, the client code will never attempt to send an IMAP LOGIN command. Support for SASL authentication identity vs. authorization identity. If the authentication method does not support this concept (e.g. AUTH=CRAM-MD5, AUTH=LOGIN, LOGIN command), the "*" character in the user name may be used to indicate a separate authentication identity; for example, "fred*joe" indicates authorization identity "fred", authentication identity "joe". UNIX-specific Changes: Support for SASL authentication identity vs. authorization identity in the IMAP and POP3 servers. If the user indicated by the authentication identity is in the "mailadm" group, he may specify any authorization identity and get logged in as the authorization identity user. If the IMAP and POP3 servers are build with PASSWDTYPE=nul, it will send LOGINDISABLED as a capability and also disable the AUTH=LOGIN and AUTH=PLAIN SASL authenticators. New MAILSUBDIR build option to change the default mailbox directory from the user's home directory to a subdirectory of the user's home directory. See imap-2000/Makefile for more information. New CHROOT_SERVER build option for closed server systems only. If defined, a chroot() call to the user's home directory is done as part of the login process. See imap-2000/Makefile for more information. New ADVERTISE_THE_WORLD build option which will add an IMAP namespace that points to the root. Not for the faint of heart. UNIX format mailboxes no longer require the pseudo-message, nor will a pseudo-message be added to a mailbox that does not have one. A new X-IMAPbase: header will be written in the first message. This is rather less efficient and robust than the pseudo-message (which remains the encouraged mechanism; UNIX format mailboxes will always be created with it), but perhaps will pacify some people who get upset by the pseudo-message. When building with MIT Kerberos it will try to detect and use libk5crypto.a instead of libcrypto.a. The mbx driver is more aggressive about cleaning up expunged messages that couldn't be purged because of shared access to the mailbox at the time of expunge. Now, every checkpoint will try to purge such messages; and a checkpoint is attempted at close time. Windows-specific Changes: New W2K port for Windows 2000. In addition to supporting SSL using the official SSPI interface (the NT and NTK ports invoke SChannel.DLL directly), the W2K port also supports Microsoft Kerberos. Note that the NT and NTK ports will work on Windows 2000, but the W2K port will not work on NT4, Windows 9x, or Windows Millenium. There is now a #user namespace, equivalent to the "~" namespace on UNIX. Changes for Developers: New c-client.h file which acts as a master include. c-client based applications should now include c-client.h instead of the individual c-client files (mail.h, misc.h, etc.). It is believed that c-client.h will work in C++ applications. New GET_FREEENVELOPESPAREP/SET_FREEENVELOPESPAREP and GET_FREEELTSPAREP/SET_FREEELTSPAREP function callbacks to free the "sparep" member of the envelope and cache elements, respectively. New OP_MULNEWSRC flag to mail_open() to use multiple newsrc files, and new GET_NEWSRCQUERY/SET_NEWSRCQUERY function callbacks to get the name of the newsrc file for news access. New "secret" nntp_article() function to do the NNTP ARTICLE command; this is generally useful only when chasing news URLs. New GET_HIDEDOTFILES/SET_HIDEDOTFILES feature to suppress file names that start with "." in mail_list() results.
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