mail-notification(1) on Linux
The text d2d87979e80d, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
Flags it lists
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--consider-new-mail-as-read -
--display -
--display-about -
--display-properties -
--enable-info -
--help -
--print-summary -
--unset-obsolete-configuration -
--update -
--usage -
--version -
-? -
-a -
-i -
-p -
-r -
-s -
-u -
-v