on 01/27/2018 09:30 PM, Karol Augustin wrote:
On 2018-01-27 17:24, CP wrote:
On 01/27/2018 02:05 PM, Matus UHLAR - fantomas wrote:
On 27.01.18 11:16, CP wrote:
I'm trying to eliminate a problem with duplicate emails in alias
expansion and I have seen that some (local generated and SMTP also)
messages don't have the Message-ID header .
I should add that such duplicity should not happen when using aliases. Also, it
may happen that two people get different copies of the same mail
(e.g. from this list).
Are you sure your duplicities can't be fixed other way?
In what way ? check alias expansion ?
The thing is I have some groups say group1 group2 and group3
there may be users that are part of only one group but there are
others that maybe in all groups .
Until I implemented lmtp and duplicate supression from it (dovecot) a
user who was in all 3 groups
would receive the message 3 times (and if send to his own email
address 4 !) The problem persists
even with lmtp and messages that don't have Message-ID in header ( I
guess this is the criteria for supressing
duplicates) .
How can I track down this ?
Thanks for your time
Dovecot documentation says: "For more complex applications, the
duplicate test can also use the content of a specific header field or
other parts of the message."
https://wiki.dovecot.org/Pigeonhole/Sieve/Extensions/Duplicate
I couldn't find specific example but maybe dovecot list is a better
place to ask. It might be possible to detect duplicates using different
headers. Anyway just Message-ID might be not a perfect solution.
If I understand your issue correctly I think that I have the same
problem that the user is a part of an alias office@ and he gets
duplicates of all mails send to him and copied to office@.
So @office -> guy1@, @guy2. If the e-mail is addressed to guy1@, office@
then Guy1 gets two copies and Guy2 only one. Often this e-mail is sent
in two different SMTP sessions so I don't see any possibility that
Postfix can catch that.
With Message-ID header and dovecot lmtp (I think lda works also) you
eliminate (a lot!!) of these duplicates so try it if you have the same
problem.
In my case I have a robot account which sends (from LAN) emails and reports
in two groups many times a day . These don't get a Message-ID header
so all
users who are in both groups get all these messages times two a day.
George
