E-mail problems

All my web sites appear to be working, yet half my e-mail addresses are failing. At the moment I'm waiting for my hosting provider to respond, but if any of you reading this have had e-mails bounce or are waiting for a reply to something, this is the reason. I'm very sorry, but it's out of my hands for the moment.

As these problems seem to be a regular occurence, I may have to look elsewhere for my hosting.