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Port 25 is open on localhost and also on my internal 192.168.1.xxx number. The nmap scan shows:

25/tcp open  smtp Postfix smtpd

Should this be the case? I am not trying to run an SMTP server. However, for all I know, this is standard for Linux. I am using Ubuntu 18.04.

I hope someone can let me know, thanks.

user203748
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  • This depends on your contextual use. Should it be open on local-host for itself? Perhaps not, and you can close the port. If you only want Port 25 traffic to come from outside your local broadcast domain, then it should be safe to block it. Just give it a shot and see the adverse effects. I have mine open, but to select hosts. – DankyNanky Jun 30 '20 at 12:38
  • Is there an approved way to close it. I could apt purge Postfix but I wonder if that's the best way. – user203748 Jun 30 '20 at 16:25

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