kuvert_submit(1) on Linux
The text 453048e7dbea, as Debian 8 (Jessie) shipped it.
MTA wrapper for mail submission to kuvert(1)
Flags it lists
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-f -
-t
The text 453048e7dbea, as Debian 8 (Jessie) shipped it.
MTA wrapper for mail submission to kuvert(1)
-f
-t