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In 2.1.7 they are buggy, and make Dovecot crash (when connected through
Evolution for instance). They have improved a lot since, though:
http://hg.dovecot.org/dovecot-2.2/file/c55c660d6e9d/NEWS
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There seem to be multiple bugs with the version from wheezy-backports
(2.2.9-1~bpo70+1), and the client is killed on THREAD commands:
guilhem@elefant:~$ telnet localhost 143
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN] Dovecot ready.
a LOGIN guilhem xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE NOTIFY] Logged in
b SELECT INBOX
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.
* 8060 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1302032711] UIDs valid
* OK [UIDNEXT 78905] Predicted next UID
* OK [NOMODSEQ] No permanent modsequences
b OK [READ-WRITE] Select completed (0.395 secs).
c THREAD REFERENCES UTF-8 ALL
Connection closed by foreign host.
:/var/log/syslog
Jun 27 21:58:01 elefant dovecot: imap(guilhem@fripost.org): Fatal: master: service(imap): child 24907 killed with signal 11 (core dumps disabled)
Jun 27 21:58:01 elefant kernel: [248570.057270] imap[24907]: segfault at 400 ip 00007f7651596e09 sp 00007fff6e267760 error 4 in libdovecot.so.0.0.0[7f765153a000+cc000]
Other (less scary) errors can be found in the syslog:
Jun 27 20:26:09 elefant dovecot: imap(xxxx@fripost.org): Error: file_dotlock_open() failed with file /home/imapproxy/fripost.org/xxxx/imapc/dovecot.list.index.log: No such file or directory
Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Error: imapc(imap.fripost.org:993): Command '11 APPEND "Sent" (\Seen) {2512485}' timed out, disconnecting
Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Error: imapc: COPY failed: Disconnected from server
Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Disconnected: IMAP session state is inconsistent, please relogin. in=2512632 out=969
This is infortunate as we cannot benefit from the 'fetch-headers'
imapc_features right now. However, the bugs (at least the segfault) seems to
be fixed as of 2.2.13-1, the version which can currently be found in testing.
Hopefully it'll be backported soon :-)
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Interesting features include caching of mail headers (v2.2.8+) as well
as new IMAP capabilities.
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E.g., ldap.fripost.org, ntp.fripost.org, etc. (Ideally the DNS zone
would be provisioned by ansible, too.) It's a bit unclear how to index
the subdomains (mx{1,2,3}, etc), though.
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(Unless the webmail is itself a full IMAP server.) It replaces
RoundCube's own IMAP and message caches.
Dovecot's IMAPC storage backend is not very documented, but provides
smart IMAP proxying. References include:
http://dovecot.org/pipermail/dovecot/2011-January/056975.html
http://wiki2.dovecot.org/HowTo/ImapcProxy
http://wiki2.dovecot.org/Migration/Dsync
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