Over the weekend I updated my mail server. Turns out if you have Dovecot installed and configured with Postfix, and Dovecot fails, Postfix stops working too. When I was trying to fix Dovecot I had mail in my mailbox, I could see it if I ran the mail command on the server. But I couldn’t see the email in my desktop client. After fixing Dovecot, I couldn’t see any new email in either place.