smtp(8) on Linux
The text 994ce1e578fc, as Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
zmailer SMTP client transport agent
Flags it lists
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-7 -
-8 -
-E -
-F -
-H -
-L -
-P -
-T -
-V -
-W -
-c -
-d -
-e -
-h -
-l -
-r -
-s -
-x