Today I had a strange problem. Mail suddenly stopped being processed by my Postfix configuration that’s been running for months. The logs looked fine up until 4:06pm, and then nothing!
Restarting Postfix didn’t make it work either. Google failed to come to my rescue too.
I eventually started thinking about the logging aspect. My Syslog stopped at the same time. Was I out of disk space? Nope. What else?
Eventually, I restarted the syslog daemon (sysklogd on Ubuntu) and it started working again.
I guess syslog needs to be working correctly for Postfix to do anything.