Tom sent me a private email. I replied and got this back. From: Mail Administrator <Postmaster@cox.net> Reply-To: Postmaster@cox.net To: craigwhite@azapple.com Subject: Mail System Error - Returned Mail Date: Sat, 5 Feb 2005 01:44:16 -0500 (Fri, 23:44 MST) is usually due to a mis-configured account or mail delivery system on the destination computer; however, it could be caused by your message since some mail systems refuse messages with invalid header information, or if they are too large. Your message was rejected by thor-new.fsklaw.com for the following reason: Address "craigwhite@azapple.com" assumed to be invalid - Impossible to verify The following recipients did not receive this message: <tms3@fsklaw.com> Please reply to <Postmaster@cox.net> if you feel this message to be in error. ---- I appreciate that mx for sklaw.com want's to be selective in its handling of inbound email. He shouldn't send private mail if his mail server is so configured that his system won't receive replies from valid sources, via valid smtp server. If he wishes to investigate - I don't have any significant headers - the above is the only details except that I use a mail server on my local network and 'smarthost' send mail through cox.net mail server. This has not been a problem for any other email activity anywhere else and automated cox.net smtp system suggests that problem is due to mis- configured mail delivery system on the destination computer. Craig Craig