Adam,
My bad, as I realized it wasn't an MTA, but was caught up reading something else when I was typing. However, this doesn't change the fact that previously, Cyrus did duplicate suppression, and Dovecot does not... which is why this worked when my imap/pop server was Cyrus, and now I get duplicates with Dovecot.
I'm not sure postfix (the MTA) should be doing the duplicate suppression. But looking around online, it seems like there is a very large argument that goes something like: "Dovecot should do it" -> "It's not dovecot's problem, it's the maillist software" -> "MTA should do it" -> "Dovecot should do it". -> Rinse, Repeat. Oh, and some argue something like procmail/sieve should do it.
Given all that, dovecot probably shouldn't do duplicate suppression. Needless, though, there's still seemingly no good answer for those that use Dovecot for imap/pop.
BTW, this is the closest I can find: http://wiki.dovecot.org/MTA
-Ryan Stasel
On Jan 5, 2010, at 09:13 , Adam McGreggor wrote:
On Tue, Jan 05, 2010 at 08:28:58AM -0800, Ryan Stasel wrote:
On Jan 5, 2010, at 06:59 , Mark Sapiro wrote:
- something in the outgoing MTA to you path that used to deliver only 1 of multiple messages with duplicate message-ids changed and is no longer dropping dups.
This looks like the case. It looks like Dovecot doesn't have any kind of duplicate suppression (at least, not that I can find
Dovecot is *not* an MTA.
q.v. <http://wiki.dovecot.org/MailServerOverview>: "As an IMAP and POP3 server, Dovecot provides a way for mail-user agents [MUA] to access their mail. As such, Dovecot is NOT responsible for receiving mail from other servers. Dovecot presents mail already stored on the system to MUA's."
or, indeed, <http://www.dovecot.org/list/dovecot/2009-November/044640.html>
(I thought the expression "Dovecot is not a[n] MTA" was *somewhere on the dovecot wiki, I can't seem to find it.)
de-duplication should be handled by the MTA before passing it to an IMAP/POP server
I'd go back to the MTA(s) (Exim, Postfix, Sendmail, &c) config, and see what's going on there.
-- ``The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.'' (George Bernard Shaw)