Tag Archives: smtp
Today I noticed I hadn’t received any mail from one of my servers for several weeks. Upon investigation I found that postfix seemed to have some trouble finding the target machine, due to what appeared to be some kind of name lookup problem. I think the problem might have been introduced through a system upgrade some weeks ago…
What’s strange is that this server could lookup the target machine just fine through DNS, in both forward and reverse.
This is what I got in the log /var/log/mail.info:
I googled this error message and found a suggestion to add a line in /etc/postfix/main.cf:
Suddenly at some point, I wasn’t able to send any e-mails. Messages got stuck in the outbox, refusing to leave my computer.
At first I thought it was a temporary problem with Google’s mail servers, as I hadn’t installed or changed anything for a week or two on my own computer.
Upon further investigation I found this link which suggested using telnet to test the connection to Google:s SMTP server.
So I ran the following command:
No greeting or anything. The telnet session just hang there.