[Dovecot] Getting two mails.....
When I receive a mail that is addressed to my email address and also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is stored on the imap srv...
Is there some option I am missing in Dovecot or isn't this possible using Dovecot?
Regards,
BTJ
--
Bjørn T Johansen
btj@havleik.no
Someone wrote: "I understand that if you play a Windows CD backwards you hear strange Satanic messages" To which someone replied: "It's even worse than that; play it forwards and it installs Windows"
On Tue, 20 Nov 2007, Bjørn T Johansen wrote:
When I receive a mail that is addressed to my email address and also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is stored on the imap srv...
Is there some option I am missing in Dovecot or isn't this possible using Dovecot?
FWIW I use procmail to filter these things out; look for "The first is out of man procmailex and deals with duplicate messages. It should be the very first recipe, and looks like this:" at http://www.onlamp.com/pub/a/bsd/2001/12/06/FreeBSD_Basics.html?page=last .
-- Asheesh.
-- Don't wake me up too soon... Gonna take a ride across the moon... You and me.
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On Tue, 20 Nov 2007, Bjørn T Johansen wrote:
When I receive a mail that is addressed to my email address and also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is stored on the imap srv...
I guess you mean: http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/DuplicateDeliveryExplained ?
As far as I know there is no such thing in Dovecot's deliver. However, deliver is easy to understand and probably you find someone to jump in and make a patch.
If you do not use Dovecot deliver, check your local MDA.
If you mean that Cyrus stores two identical mails only once physically, e.g. when spooling for two users, then no, because Dovecot is not designed to only support virtual users, but with real users two users cannot easily share the same file.
Bye,
Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux)
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On Wed, 21 Nov 2007 09:05:14 +0100 (CET) Steffen Kaiser skdovecot@smail.inf.fh-bonn-rhein-sieg.de wrote:
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On Tue, 20 Nov 2007, Bjørn T Johansen wrote:
When I receive a mail that is addressed to my email address and also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is stored on the imap srv...
I guess you mean: http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/DuplicateDeliveryExplained
Yes, this is what I mean..... :)
?
As far as I know there is no such thing in Dovecot's deliver. However, deliver is easy to understand and probably you find someone to jump in and make a patch.
If you do not use Dovecot deliver, check your local MDA.
Yes, I use Dovecot deliver....
If you mean that Cyrus stores two identical mails only once physically, e.g. when spooling for two users, then no, because Dovecot is not designed to only support virtual users, but with real users two users cannot easily share the same file.
Nope, this is not what I mean....
BTJ
Switch to Exim4 for your MTA. It won't Append 2 files to the same
directory if it can see they both route to you.
Mark.
On 21 Nov 2007, at 08:50, Bjørn T Johansen btj@havleik.no wrote:
On Wed, 21 Nov 2007 09:05:14 +0100 (CET) Steffen Kaiser skdovecot@smail.inf.fh-bonn-rhein-sieg.de wrote:
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On Tue, 20 Nov 2007, Bjørn T Johansen wrote:
When I receive a mail that is addressed to my email address and
also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved
to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is
stored on the imap srv...I guess you mean: http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/DuplicateDeliveryExplained
Yes, this is what I mean..... :)
?
As far as I know there is no such thing in Dovecot's deliver.
However, deliver is easy to understand and probably you find someone to jump
in and make a patch.If you do not use Dovecot deliver, check your local MDA.
Yes, I use Dovecot deliver....
If you mean that Cyrus stores two identical mails only once
physically, e.g. when spooling for two users, then no, because Dovecot is not
designed to only support virtual users, but with real users two users cannot
easily share the same file.Nope, this is not what I mean....
BTJ
On 21.11.2007 23:16, Mark Adams wrote:
Switch to Exim4 for your MTA. It won't Append 2 files to the same directory if it can see they both route to you.
Mark.
On 21 Nov 2007, at 08:50, Bjørn T Johansen btj@havleik.no wrote:
On Wed, 21 Nov 2007 09:05:14 +0100 (CET) Steffen Kaiser skdovecot@smail.inf.fh-bonn-rhein-sieg.de wrote:
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On Tue, 20 Nov 2007, Bjørn T Johansen wrote:
When I receive a mail that is addressed to my email address and also with a cc to a mailinglist I subscribe to, I get two mails, which I guess is expected... But I have just moved to Dovecot from Cyrus, and Cyrus seems to know that this is the same mail, so only one of those two mail is stored on the imap srv...
I guess you mean: http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/DuplicateDeliveryExplained
Yes, this is what I mean..... :)
?
As far as I know there is no such thing in Dovecot's deliver. However, deliver is easy to understand and probably you find someone to jump in and make a patch.
If you do not use Dovecot deliver, check your local MDA.
Yes, I use Dovecot deliver....
If you mean that Cyrus stores two identical mails only once physically, e.g. when spooling for two users, then no, because Dovecot is not designed to only support virtual users, but with real users two users cannot easily share the same file.
Nope, this is not what I mean....
BTJ
How does exim4 detect this? Usually second mail little bit later. So there only one thing you can compare is message-ID.
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On Wed, 21 Nov 2007, Mark Adams wrote:
Switch to Exim4 for your MTA. It won't Append 2 files to the same directory if it can see they both route to you.
Well, I expect any MTA to deliver a mail just once, if two recipients evaluate to the same mailbox. But to detect two deliveries in two separate mails is another problem and, because MessageIDs are not as globally unique as they should, there is no fail-proof method in order to detect them.
Bye,
Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux)
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On 22.11.2007 10:06, Steffen Kaiser wrote:
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On Wed, 21 Nov 2007, Mark Adams wrote:
Switch to Exim4 for your MTA. It won't Append 2 files to the same directory if it can see they both route to you.
Well, I expect any MTA to deliver a mail just once, if two recipients evaluate to the same mailbox. But to detect two deliveries in two separate mails is another problem and, because MessageIDs are not as globally unique as they should, there is no fail-proof method in order to detect them.
Bye,
Well in case for example dovecot mail list when you reply by pressing reply all, it generate same message-id for these two messages. Anyway I'm agree with you, we can't be sure for all such cases.
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On Thu, 22 Nov 2007, Nikolay Shopik wrote:
evaluate to the same mailbox. But to detect two deliveries in two separate mails is another problem and, because MessageIDs are not as globally unique as they should, there is no fail-proof method in order to detect them.
Well in case for example dovecot mail list when you reply by pressing reply all, it generate same message-id for these two messages. Anyway I'm agree with you, we can't be sure for all such cases.
The message ID is to be created by the sender, hence, is should be the same for both mails. (If the ID is added by a MTA, it's a SPAM indicator ;-) )
But although message IDs are required to be "globally unique" by RFC, it's a piece of data created by plenty of individual MUAs, bulk mailers, selfmade scripts etc.pp. Each implement a different strategy to acquire the "global uniqueness" (e.g. by putting together local hostname, mail domain, current time). But no such method is really fail proof. And at least - it is data any user can fake.
Bye,
Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux)
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Well in case for example dovecot mail list when you reply by pressing reply all, it generate same message-id for these two messages. Anyway I'm agree with you, we can't be sure for all such cases.
Hi Nikolay,
As Steffen has already said, the "message-id" is not the same as the ID you will get from your MTA in the Received: Header
If the IDs in the received header on your end do not match, that is 2 seperate deliveries so you will get 2 in your box.
Different mail clients can get around this by hiding dupe threads (mutt for instance).
Mark
participants (5)
-
Asheesh Laroia
-
Bjørn T Johansen
-
Mark Adams
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Nikolay Shopik
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Steffen Kaiser