I am looking for assistance with debugging a problem with sending email.

After a coworker upgraded SLES 12 from SP2 to SP3, the server can no longer send email. He tried to telnet to the email server and doesn't receive the 220 message back.

We've asked the Network team to see if there was a change to a firewall or something else in the network and they said that there isn't anything that will prevent the server from contacting the email server.

I checked and the xinetd service is running, but I can't remember how to configure it to run postfix. I have spent a good hour or more searching Google but haven't stumbled across anything helpful.

Any ideas what else I can check?