On (info "(mailutils) Mail Variables")
'showenvelope'
Type: Boolean
Default: Unset
If this variable is set, the 'print' command will include the STMP
envelope in its output.
Alas showenvelope is defective, gluing the result to the front without a
newline:
$ echo test|mail $USER
$ echo -e set showenvelope\\np 1\\nx|mail.mailutils --nosum|head -n 1
>From (null) Tue Dec 25 14:28:23 2018Return-path: <jida...@jidanni.org>
$ mail.mailutils --version
mail.mailutils (GNU Mailutils) 3.5
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