esmtp(1) on Linux
The text c46af500c6ce, as Debian 4.0 (Etch) shipped it.
libESMTP to Sendmail compatibility interface
Flags it lists
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-- -
-Ac -
-Am -
-B -
-C -
-F -
-G -
-N -
-R -
-V -
-X -
-bD -
-bH -
-bP -
-ba -
-bd -
-bh -
-bi -
-bm -
-bp -
-bs -
-bt -
-bv -
-f -
-i -
-n -
-qf -
-r -
-t -
-v