Trouble configuring sendmail to relay mail

Posted by Warren Schubert on Server Fault See other posts from Server Fault or by Warren Schubert
Published on 2013-10-23T15:08:07Z Indexed on 2013/10/23 15:56 UTC
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Filed under:

ubuntu

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sendmail

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relay

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ufw

I am trying to configure sendmail and ufw on an ubuntu server (ServerA) so that another server (ServerB) can send mail through it. In my /etc/mail/access file I have the following line (a.b.c.d is the IP of ServerB):

Connect:a.b.c.d    RELAY

My ufw status shows the following rule I added:

25/tcp                     ALLOW       a.b.c.d

When I telnet from ServerA I get through:

telnet localhost 25

When I telnet from ServerB I don't (w.x.y.z is the IP of ServerA):

telnet w.x.y.z 25
telnet: Unable to connect to remote host: Connection refused

I did restart the sendmail daemon after editing the access file.

What could I be missing? Something in sendmail.mc?

Edit:

netstat -an|grep -w 25
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN

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