"Monique Y. Herman" <[EMAIL PROTECTED]> writes:

> The "to" rule is a little non-intuitive (in my opinion).  If you're
> part of a mailing list, for example, it often won't work.  I can
> never remember the exact rules, because I simply don't have a strong
> enough understanding of the ins and outs of email.

This is explained at the top of http://tmda.net/filter-sources.html

It might help to remember that incoming 'to' entries match the final
recipient address as your MTA's local delivery agent is delivering the
message to you.  For example, if you subscribed to the tmda-users
list, the _final_ recipient address is [EMAIL PROTECTED], not
[EMAIL PROTECTED]

I agree with you that this is non-intuitive.  Most people assume 'to'
refers to the address in the 'To:' header ([EMAIL PROTECTED] in our
example).  I think this stems from the fact that most people don't
understand the difference between the envelope sender and recipient
addresses defined during the SMTP transaction[1], and those in the rfc
2822 headers of the message ('From:', 'To:', 'Cc:', etc).  These may
or may not be the same.  The envelope information however is much more
reliable, which is why TMDA caters to it.

Footnotes: 
[1]  http://cr.yp.to/smtp/client.html
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