In preparing for our mail server upgrade, I’m setting up a new test server, just to make sure that everything will be working together as I hope it will. I had a problem with sendmail in that I was able to receive mail ok, but was unable to send it. In the mail logs, I got messages like this:
Sep 17 08:47:03 server sendmail[2884]: l8HDkmas002884: yo.robot.com [192.168.52.8]: possible SMTP attack: command=AUTH, count=3
Since yo.robot.com is my computer, I knew we weren’t getting hacked. The problem was that I didn’t have saslauthd running on the mail server. As soon as I turned it on, things were working fine.