Hello,

I am using dovecot 1.2.9, and the sieve plugin for filtering incoming messages into specific folders. The MTA is postfix, and deliver is called using the "mailbox_command = /usr/lib/dovecot/deliver" directive.

Is it possible to make dovecot's deliver discard duplicate messages?

With cyrus there is a duplicatesuppression directive which works well (http://cyrusimap.web.cmu.edu/imapd/overview.html#duplicate). With procmail, this can be done with the following recipe, but I did not found an equivalent for dovecot:

One often receives duplicate messages for cross-postings to mailing

lists, or explicit replies to a post from you in addition to the

mailing list message.

The following recipe eliminates all duplicate messages. It tells

formail(1) to keep a cache file of the Message-IDs of the most

recent messages you've received. Since Message-IDs are guaranteed

unique for distinct messages, they are ideally suited to weed out

duplicates.

:0 Wh: msgid.lock | formail -D 65536 .saves.msgid

Thanks,

Nicolas