full-disclosure - SPAM and "undisclosed recipients"

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From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu)
Subject: SPAM and "undisclosed recipients" 

On Sat, 15 Nov 2003 11:10:37 EST, Kristian Hermansen <khermansen@...technology.com>  said:

> I have a small question about SPAM emails that are sent to "undisclosed
> recipients".  Does this just mean that the server stripped the header before
> sending it to my account?  I don't understand how it could make it to my
> server, let alone my email account, if nothing was specified.  Does this
> raise any security issues?

Mail is actually routed via the RFC821/2821 MAIL FROM and RCPT TO commands, not
by the RFC822/2822 From:/To:/cc:/Bcc: lines.  Think - mail from this list gets to you
even though you're not in the To: line. :)

"undisclosed recipients" just means that somebody/something decided to add into
the rfc822 headers the fact that the mail was bcc'ed to multiple people.

See rfc2822, sections 3.6.3 and 5 about bcc: for more details on this.
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