[pfx] Re: Avoiding message doubling via virtual aliases

Steffen Nurpmeso via Postfix-users:
> Steffen Nurpmeso via Postfix-users wrote in
>  <20260502125527.MCetN6WF@steffen%sdaoden.eu>:
>  |Wietse Venema via Postfix-users wrote in
>  | <[email protected]>:
>  ||Steffen Nurpmeso via Postfix-users:
>  ||> Steffen Nurpmeso wrote in
>  ||>  <20260501161007.Ke-AtUes@steffen%sdaoden.eu>:
>  ||>|I have a problem with my mailing-lists that i thought to avoid by
>  ||>|using address rewriting via virtual_aliases, like so:
>  ||>|
>  ||>|  virtual_alias_maps = regexp:$meta_directory/virtual_re
>  ||>|
>  ||>|  ./virtual_re:/^(s-mailx(.*))@sdaoden.eu/ ${1}@lists.sdaoden.eu
>  ...
>  ||(virtual)alias expansion happens after ${1}@lists.sdaoden.eu list
>  ||expansion.
>  |
>  |I do not understand how you mean this?  The
>  ...
>  |  /usr/sbin/sendmail -bv [email protected] [email protected]
>  ...
>  |  <[email protected]>: delivery via local: delivers to command:
>  |      /var/mailman/mail/mailman post s-mailx
>  |
>  |  <[email protected]> (expanded from <[email protected]>): \
>  |  delivery via
>  |      local: delivers to command: /var/mailman/mail/mailman post s-mailx
>  ...
>  |I am thankful for any suggestion that leads me to a solution.
>  ...
> 
> And if i search "duplicate" in postconf(5), i perceive from what
> i read that deduplication should happen?  I do not modify any
> setting mentioned nearby.
> In my opinion the above example should only deliver "one message
> instance".

Before mailing list expansion, both virtual_alias_maps expansion and
recipient deduplication happen while an inbound message is written
to a queue file.

After mailing list expansion, both virtual_alias_maps expansion and
recipient deduplication happen while an outbound message is written
to a queue file. 

By default, deduplication happens only for the first 1000 recipients
(duplicate_filter_limit = 1000). You can set the limit larger;
modern systems should handle 10x or 100x easily.

	Wietse
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