My MTU (exim) add the following header:
Envelope-to:
to all mails which is nice.
But do the ^TO macro catches that one?
TO^ seems to be:
(^((Original-)?(Resent-)?(To|Cc|Bcc)|(X-Envelope|Apparently(-Resent)?)-To):(.*[^-a-zA-Z0-9_.])?)
and that doesn't incl "Envelope-to:"
so a mail with fake headers but correct "Envelope-to:" header will not be
sorted correctly by my procmail filters if I have:
:0 H
* ^TO_secret(_at_)secret(_dot_)com
! echelon(_at_)topsecret(_dot_)com
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