Thread: Server Hacked?
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Old 26th January 2012, 15:17
silenceti silenceti is offline
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Originally Posted by till View Post
If noone needs to connect to the mailserver from external IP's, then close port 25 in the firewall. If you want to change or add a additional listen port, then edit postfix
I've tried to add an additional port and block port 25 in my server.... i can add for example 27 port, but i can't connect to it...

This problem is getting me mad!

"from=<> to=<> proto=SMTP helo=<>

NOQUEUE: reject: RCPT from unknown[myIP]: 451 4.3.5 <unknown[myIP]>: Client host rejected: Server configuration error; from=<> to=<> proto=SMTP helo=<> "

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