Re: [CentOS] postfix and mail origin checks

Karanbir Singh wrote:

hi,

Whats the 'robust' way to make sure email to a specific destination is only accepted if it came over the localhost:25 or /usr/sbin/sendmail route ? anything else should get a 5xx error. Emails to other destinations should remain unaffected.

Using postfix/c4. Had a look around, and header_checks might be one way to go.

The easiest way is probably to edit master.cf and make smtpd only listen on localhost:25.

So instead of

# smtp inet n - n - - smtpd

Use

127.0.0.1:smtp inet n - n - - smtpd

Otherwise us an access table.

Glenn