I guess you have several options. One is using Dovecot with Sieve:
https://doc.dovecot.org/2.4.1/core/config/sieve/extensions/duplicate.html#sieve-duplicate-extension
https://datatracker.ietf.org/doc/html/rfc7352
Op 18-9-2025 om 14:49 schreef Kevin Kretz via dovecot:
Hi,
We use Dovecot and Postfix for internal emails and keep aliases in an LDAP
table. We have multiple sites, with some user mailboxes local to each.
If user A and B are both in alias OurGroup, and a message is sent to
[1][email protected] [2][email protected] and [3][email protected], a and b
will
receive two copies of the message.
Should this be addressed with Postfix or Dovecot?
thanks
References
Visible links
1. mailto:[email protected]
2. mailto:[email protected]
3. mailto:[email protected],
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