Spam addressed to a sender but received by everyone else

Solution 1:

This is just a BCC (Blind Carbon Copy). Test it by sending mail to [email protected] and BCCing yourself. It was originally specified in RFC 733 (replaced by RFC822 and later by RFC2822). Both RFC 2821 and RFC 2822 mention issues with BCC (see Security Considerations section).

Solution 2:

The headers could say "To: The Whole World ", it means nothing to the actual routing and delivery of the message. The rcpt to:<[email protected]> is the only thing that matters; most servers also put the 'rcpt to' in the 'Received' header line.

Edit:
For example, I got an e-mail yesterday with these headers:

Received: from mx2.freebsd.org ([69.147.83.53])
     by aislynn.stoneyforest.net with esmtp; Thu, 01 Jul 2010 18:43:28 -0400
     id 00000108.4C2D1A10.00012CA8 for <chris[at]stoneyforest.net>
To: freebsd-security-notifications[at]freebsd.org,
     freebsd-announce[at]freebsd.org

In my e-mail reader it say "To: freebsd-announce[at]freebsd.org" and nothing at all about my e-mail address. If your running Exchange the e-mail has to come from an SMTP source for it to have the Received header; Exchange does not follow RFCs for internal e-mail.

Spam addressed to a sender but received by everyone else

Solution 1:

Solution 2:

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