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I asked hypothetical question. I wanted to find how people prepare for it. Only people with experience in this know how to fix it before it happens. I am very close to stop outgoing spam using postfix filters. Greylisting can be used for incoming spam.
répondu il y a 2 ans
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Well, if your instance has been hacked, I would suggest shutting down the mail server and focus on getting your server secure.
After you've secured your server, clear the outgoing mail queue.
répondu il y a 2 ans
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If a hacker has the skill to get into your instance and use your mail server to send spam out, they probably have the skill to evade outgoing filters.
That said, there are way to have services like spamassassin scan outgoing email, but I haven't looked into them.