Hello dear Postfix users, I am managing a postfix server (version 2.5.5), but I did not installed it. This server accept mail submission on port 25 after sasl authentication... I would like to stop it, because this is a security issue. External servers on internet are trying brute force attacks on passwords... It is also configured to use port 465 smtp over tls for the users of the domain of my local lan.
According this links : https://unix.stackexchange.com/questions/145499/postfix-disable-authentication-through-port-25 It is possible to stop sasl mail submission on port 25. I am not familiar with mail system, is it the good way to do ? I am also wondering if I could add support for smtps port 587 in master.cf (for the moment only 465 is set). Can both 465 and 587 ports be configured at same time ? Best Regards -- Sent from: http://postfix.1071664.n5.nabble.com/Postfix-Users-f2.html
