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Comments
Port 587. Port 2525 may be supported on some systems too.
outgoing mail:
smtp - tcp 25
smtps - tcp 465
PS: Also block 26 and 587.
To be absolutely sure and for additional security block all ports from 0 to 65535.
Dearest eol,
This would block every port on the machine ensuing nothing would have access to the internet. Is this your intention?
With Warm Regards,
James B Peach
Yes, and vice versa.
Don't block specific ports.
Instead, block everything. Then allow specific ports for the services your server is running.
Exactly.