what POP email client are you using?
THo I swear by Pegasus mail, it weirded out two days ago and one of the POPs kept coming back with bad password even tho I kept putting the correct one in. I deleted the account in the client and rebuilt it and now it works again. I was blaming Webmin and had to grouse for forgiveness
Oh, I'm running Qpopper on my Slack10.0 box