Marek Podmaka via Postfix-users:
> Hi,
>
> When/how does postfix prevent duplicate deliveries when delivering to an
> alias and explicitly also to the alias result? For example all@domain + Cc
> to one of the members of that alias. I have found parameters
> "duplicate_filter_limit" and "enable_original_recipient" that mention it,
> but I don't understand how exactly it works.
The above duplicate filter is in effect when Postfix writes recipients
to a queue file. This happens after virtual alias expansion,
always_bcc, sender_bcc_mapsm, recipient_bcc_maps, and after any
recipients added with Milter actions.
When enable_original_recipient is turned on, the above duplicate
filter will NOT discard duplicate recipients that differ in their
"original recipient" address. This is for use cases where all mail
for a domain is received in a single mailbox, and where the original
recipient is obtained from the X-Original-To: header.
> I have an older mailserver where this works (no duplicate deliveries,
> otherwise someone would complain). I am using virtual users with default
> virtual delivery.
>
> I also have another mail server also with the same type of virtual users
> (same database schema), but which was setup with Dovecot LDA as delivery
> agent. And there the deduplication doesn't work, I had to use
If that is the only difference: you changed from delivery with the
virtual delivery agent to delivery with the lmtp or pipe delivery
agent, then Postfix still delivers the same recipients.
If there is a difference in deduplication, then you have introduced
a difference up-stream of the delivery agents. You need to find
that difference.
I siggest that you start with comparing the outputs from "postconf
-n" on the old and new servers.
Wietse
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