I have qmail installed on a dedicated server. All has been running smoothly for a while, then suddenly I stopped getting mail. I did a:

qmailctl stat

...and it showed that qmail-send was having some issues. I sorted them out and re-running that command showed that qmail-send, qmail-pop3d and qmail-smtpd were all running properly.

I've sent some test emails to myself and none have arrived. The logs look fine and my test emails show up in the smtpd log.

Does anyone have any advice?

Thanks.