A month ago, I received an email from a visitor to my online business, containing a simple suggestion. Thereafter, I keep getting the same freakin email in one-minute spurts every now and then.

For example, this morning I received the same email this morning at 9:36,37,38,39, ...,47, then it stopped. It started up again at 12:27,28,29, .., up to 12:35. This sort of thing has been happening every few days. Hundreds of them. And, the contents of this email isn't spam or anything and was (originally) a genuine user suggestion. I contacted the original author and he says he doesn't know what's up.

Does anybody know what the heck could be going on?

If you're using POP then for some reason the mail isn't deleting from the POP server, it could have some freakish date on it.

You can telnet to the POP server, list the emails, identify which one it is and then delete it without reading it.