Re: [exim] Disable deduplication

On 7/17/20 3:29 AM, Evgeniy Berdnikov via Exim-users wrote:
> On Fri, Jul 17, 2020 at 12:21:54AM +0200, Heiko Schlittermann via Exim-users wrote:
>> Evgeniy Berdnikov via Exim-users <exim-users@???> (Do 16 Jul 2020 18:14:21 CEST):
>>> Unique mails MUST have unique Message-Id's. Some mail storage systems
>>> (Cyrus, for example) remove duplicates by message-id automatically.
>>
>> And I'm looking for the cyrus option, that would disable exactly this.
>
> AFAIK, this is a hardcoded behaviour of Cyrus, without any regulation.
> But partially broken in some versions, :) say, cyrus 2.5.10 sometimes
> don't remove duplicates, this is definitely a bug.
>
> If you want to keep duplicates in IMAP box, I recommend Dovecot.

Not sure about the newer versions of Cyrus but 2.4.x had this option:


duplicatesuppression: 1

If enabled, lmtpd will suppress delivery of a message to a mailbox if a
message with the same message-id (or resent-message-id) is
recorded as having already been delivered to the mailbox. Records the
mailbox and message-id/resent-message-id of all successful deliveries.


>
>> Often I get responses to list messages as (B)CC. The (B)CC often arrives
>> sooner than the response via the list. But only the response via the
>> list would give me the right list headers for replying and such.
>
> You may put procmail filter behind cyrus deliver to remove duplicates
> that are Cc/Bcc copies to know list addresses, in order to wait for a
> copy from list manager. It may be done with custom router for cyrus
> delivery: run procmail and call cyrdeliver on the end of recipe.
>
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