Received internal error while trying to submit bug report

I was an unconfirmed user submitting my first bug report, and with two different email addresses (different domains) I received an internal error that said it could not send an email to either address, and asked me to report the problem to this mailing list. Once I removed the patch file I was trying to send, everything worked fine. If the error message had said that was the problem in the first place, it would have been a lot less frustrating. If the problem was not the patch file itself, then it may have been the fact that the extension was .diff, instead of .txt. I discovered *that* problem while trying to add the patch to the initial bug report. Rob