Hey, can we add this as a feature to the mailing list ;) I would really like to write some sendmail rules to emulate this globally >:) Subject: Microsoft Outlook (Express) bug.. Hello. Recently we've been receiving calls from customers not being able to check their e-mail because Outlook/Outlook Express says to check their "Memory and Diskspace" (or something along those lines..). I began looking at their /var/mail/ mailbox, and I noticed a similarity with all of them. They had receieved some spam which had left the "BCC:" and "Reply-to:" headers blank. So I attempted to reproduce the error, and it worked. Outlook Express wouldn't retreive any e-mail, if there was an e-mail that had those two feilds blank! I couldn't believe it. I attempted to contact Microsoft early last week, but received no reply. I haven't had much of a chance to test versions or anything as of yet, so feel free. It would certainly be unfortunate if someone were to write a program that would generate an e-mail like this, and do some mass mailing.. ;-)