It’s poop! Poop I tell you…
anyways, same problem here, I did manage to find my lost emails by going into the ftp and into the folder MAILDIR/new open those files with notepad or notepad++
Looking at those files the trouble started around the 25th of october with some mails being blocked, and around today with all mails from contactforms being blocked…
havent found a way to fix it yet though..
btw im on Dreamhost