mailagent(1) on Linux
The text 7e7a9cd5745d, as Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
an automatic mail-processing tool
Flags it lists
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-F -
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-d -
-h -
-i -
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-o -
-q -
-r -
-s -
-t