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Postfix relays e-mails from specifically constructed adresses

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Postfix relays e-mails from specifically constructed adresses

Pablo Kubiak
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Hello.
My e-mail server relays mail from addresses constructed according to the following pattern:
several_letters_and_digits-existing_login=mydomain@senderdomain
for instance:
inis106135344-wchurchill=mydom.ain@sender.dom.ain
which means that unauthorized users can send messages from my domain.
How to block this behaviour?

Regards,
Pawel
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