Our friend, bynum(_at_)NU(_dot_)CS(_dot_)FSU(_dot_)EDU (Mark J. Bynum), wrote:
This is not really a procmail question, but how do mailing lists send to
specific users. My address doesn't appear anywhere in the header. Do
they do it the same way as Bcc: does?
Basically. There is something called the envelope which is what hte
delivery agents tell each other. The headers are not really used for
delivering mail (although the received headers are used for checking for
loops and sometimes the Precedence headers are used to see what should
go on queue runs). This is often called the envelope.
Of course you can tell sendmail to read the headers with the -t option,
but this is not the default behaviour
Soren