smtpfeed(8) on Linux
The text 91fb2984b5b4, as Debian 2.1 (Slink) shipped it.
SMTP feed, SMTP Fast Exploding External Deliverer for Sendmail
Flags it lists
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-1 -
-F -
-M -
-R -
-V -
-a -
-b -
-c -
-d -
-h -
-i -
-l -
-m -
-n -
-o -
-p -
-r -
-s -
-y -
-z