vrfy(1) on Linux
The text 62fefe50bd7b, as Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
Verify electronic mail addresses
Flags it lists
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-H -
-a -
-d -
-e -
-h -
-l -
-n -
-s -
-v