Check your scripts

I've blogged about this issue before but here it is again. I was attempting to register for an online event and got this error message:

Yes folks, once again here's a form script that belives only e-mail addresses that end in two- or three-letter top level domains are valid. Sorry, but how about .info (mine), .mobi, .museum? Check your form scripts if you haven't yet. Please fix this problem.