How to close an open relay on Sendmail?

Posted on 2003-03-03
Medium Priority
Last Modified: 2006-11-17
Hi!  I'm new to Sendmail and have installed version 8.12.5 on a Redhat 8 machine.  It was installed using the RPM that came with RH.  Everything functions fine (as in I send and receive mail) but when I run a test here: http://members.iinet.net.au/~remmie/relay/
it says I have an open relay.  The server I am testing is mail.tmallow.com. My files are as follows:

commented out the line the line DaemonPortOptions=Port= so that Sendmail would listen on all devices

has the line "192.168.0" to allow my network to send mail

relay-domains is empty

has the line "tmallow.com" so that I accept mail for my domain.

As I stated I am new to sendmail so my asumptions about what these files do may be wrong.  Thanks alot.

Question by:tmallow
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Accepted Solution

Jivko earned 200 total points
ID: 8064311
If relay-domains is empty and you have only 192.168.0" you do not have a open relay MTA. Do not trust this http://members.iinet.net.au/~remmie/relay/

Author Comment

ID: 8064547
I have since realized that it only allows me to relay if the recipient name is within my domain.  I guess that isn't of much use to a spammer, all they could do is send mail to my domain.  Thanks Jivko, I needed reassurance that my setup was OK.

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