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We also have an external catchall server. We pull the mail with a pop2smtp Gateway and forward it direct to our kerio mailserver in our DMZ. We send via a relay on the same Server. Works perfect, but.....

When we got an Mail from a Mailingslist:
TO is mail<_at_>
FROM is mail<_at_>
CC is mail<_at_>
CC is mail<_at_>
CC is mail<_at_>

The SMTP in kerio works like a SMTP: "ok, 'mail<_at_>' is not here, i will sent it to him".

How can i change this behaviour?
With rules like "Receiver is not or sender is not" -> BLOCK, it blocks all.
When i block all mails wich are not from *<_at_> in the SMTP, there is still the default rule "sent with MX records" i cant delete or deactivate.

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