preventing postfix from listening on port 25
 

Hi,

how can I prevent postfix from listening on port 25? I want postfix to be used for sending mails from the local system only, not as a mail server.

I am running Debian (2.6.18-5)

Thanks for you help.

it will always need to listen on 25 locally, but you can stop it listening externally by using the inet_interfaces option, e.g. "inet_interfaces=localhost" in your main.cf

Or just use iptables to block all incoming or outside port 25 requests outside of your local network. Allow outgoing though.

Or just do not run postfix in daemon mode.

If you want to use the "sendmail" command to send emails, you may comment out the smtp inet n - n - 1000 smtpd line at master.cf

You can also block out the port 25 for incoming connections with iptables.

# iptables -I INPUT -p tcp --dport 25 -j DROP

You might consider putting this in main.cf:This causes the postfix smtpd to listen only on the loopback interface, making connections from external hosts impossible. You should read the STANDARD_CONFIGURATION_README and its prerequisites.
[edit]i see acid_kewpie already gave the same advice. just add my vote to his reponse.[/edit]