Thanks Sam.
So let me put it another way... other than internally generated courier messages, and delivery status notifications, could there be an empty sender?
Anyone can use any return address for any message, including an empty one; but officially only delivery status notifications (which includes bounces, delivery receipts, and vacation messages) are supposed to have an empty return address. And, of course, anyone can be running a vacation autoresponder.
I'm trying to determine if in my mailfilter it is "safe" to accept
messages with empty sender, or if there are possibilities of malicious or junk mail in which the sender is empty?
Of course there's junk mail around with an empty sender; just like there's plenty of junk mail where the sender address is set to <[EMAIL PROTECTED]>.
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