==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 2024030401
- Deployed with iRedMail Easy or the downloadable installer? Easy
- Linux/BSD distribution name and version: Debian 10
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): NGinx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi,

I need to filter mail going through our iredmail server. A customer sends an autoreply to every mail we send them. Those mails first go to a mailbox-Account that is set to forward all mail. Mail is forwarded to an alias, also on our Server.

How can I filter those mails centrally, not having to go through all final destination mailboxes?
I tried Sieve filter on the first account, but that does not work, which was pretty obvious, as this filtering is done, when the mail is stored to a mailbox.

Thanks, best
Jochen