"Fox" said:

> If I am getting spam with "Undisclosed recipients" in the header, how would
> the mail server (qmail) have known who to deliver it to had it not been
> spam?  Or does the server (qmail) just choose to log messages with bcc's as
> undisclosed recipients even though it knows who the message is to?

The latter -- it knows from the "envelope address".  see some mail RFCs
for more details ;)

> Are all "Undisclosed recipient" type emails spam?

nope -- Bcc: is an accepted way to forward if you want to keep some
people's email addrs secret, for example.

--j.

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