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How to use the sender blacklist as blackhole?

Hi ,
We are using an Astaro 5.206. Thousands of emails are coming as ‘delivery failures’ to us. The sender address is faked. So it seems that someone of our domain has sent the email. The blacklist of the Astaro just bounces a message. Is it possible to drop every message that come from outside and have the sender domain from our inside domain.

Thanks for help!

Best regards,

Thor


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