(AFAIK sendmail and friends always run stuff under the user's real and
effective uid, so I don't think slocal should ever be setuid).
If you run "slocal" from ".forward", then it runs as the recipient
(the person using ".forward"). But there are advantages to running
slocal as a mailer defined in sendmail.cf
Do people even _do_ that? I've written sendmail mailers myself, but
I can't really see any advantage for doing this here.
We must also remember that there are other MTAs than sendmail.
Hence the reason I said, "sendmail and friends".
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