Some e-mail programs will put a dummy name in the To: field if you put
e-mail addresses in the BCC: field and nothing in To:. Outlook Express
is the one that I know of that specifically uses that
"Undisclosed-Recipient;;" text. Outlook doesn't do this; if you send a
message out with addresses in BCC but nothing in To, it will either be
rejected by your ISP, or your recipients will receive a message with a
blank From field, which most anti-spam filters will promptly throw into
the trash heap.
--
Jocelyn Fiorello
MVP - Outlook
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