Hello,
someone is using another (open) smtp server to send spam with a "From:" header with an unknown user of one of my domains. So bounced messages are send to _my_ astaro box, which relay/send the bounced message (after virus check) to an internal mail host, which bounce-bounce the message back :-(
How can I stop this? I've got about 1000 bounce-bounce messages per day from my astaro box.
Can I configure qmail on the astaro box to reject messages for specific user@domain.tdl?
Can anyone help, plesae?
Axel.
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