Alan wrote,
I suggest you consider using Pine for you emails as Pine allows sending
filters.
Mutt and mailx can do it as well. Procmail's -m option is ideal for
such use.
Easier than using mutt's sendmail 'hook' might be to use the $sendmail
variable and set it to a shell script that pipes the message through
procmail as above.
For clients (like Outlook) that connect directly to an smtp server,
perhaps using an smtp proxy, would work, if that proxy has the
ability to first collect the entire message, and then passing it
through an external program (procmail) first before forwarding it?
BTW, this page, http://www.technoids.org/procmailfilter.html
tells how to hack sendmail to invoke procmail on outgoing, or
relayed, mail.
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