sendmail spam problem

[abehzadi]

Hi people,
I am running AIX.4.3.3.0 with SendMail 8.7.
I just found out that someone from the outside has been using my server to send out spam. I know that I have to disable the relaying agent for SendMail; but I am having difficulty figuring out how to!*&$.
Could someone please help me before my ISP disconnect and Black List me.

Thank you

PS: I have also set up a SonicWall firewall, but I need to open the SMTP port for Sending out.

 

[aixmurderer]

You probably need an entry like this to this in your sendmail.cf file, the question is if your version of sendmail supports it:

# Hosts for which relaying is permitted ($=R)
FR-o /etc/mail/relay-domains

Create the relay-domains file and enter the domain names in there for which you will allow relaying. IBM Certified Confused - MQSeries
IBM Certified Flabbergasted - AIX 5 pSeries System Administration