Securing Port 25

[QORNA]

Hi all,

We run a Sendmail 8.12 server on RH Linux 7.1 . Is there any way to secure port 25 to prevent people from connecting to it (e.g via telnet) to send fake mail, while not affecting the normal operation of Sendmail.

Any ideas?

Thanks.


-Qo

 

[jad]

you can't stop which program is connecting to port 25.
You can however set up where you accept mail from (access.db); or if you want to stop every other possible offender you could set up 'ipfilter', but only if you know the IP addresses/netmasks of the hosts which need to access port 25.