sending automated GPG signed mails from batch job

[Matthias Apitz]

Hello,

Our Library Management System sends mails to patrons and media vendors
which are assembled in a shell script with all data (Subject, body, To,
attachments, etc) by a call to the MUA mutt 2.1.1 which pipes the mail
to sendmail:

#!/bin/sh
#
# $Id: sisis2mail.sh 381380 2020-11-06 07:49:50Z apitzm $
#
# filter mails ensuring mails sent are RFC compilant
# the mutt program (installed by sisis-pap) assists in that
# usage: sisis2mail.sh [ --cat [ file ]          |
#                        --body-as-text          |
#                        --body-as-html          |
#                        --body-as-text-and-html |
#                        --body-as-attachment    |
#                        --attach-file filename  |
#                        --inline-images dirname ] [ file]
#
# input may be a file or stdin
# output goes to stdout
...

How could we expand this for signing mails on the fly?

Kevin, I saw your reply in 
http://lists.mutt.org/pipermail/mutt-users/Week-of-Mon-20210412/002737.html
...
On Mon, Apr 12, 2021 at 09:50:59AM +0200, Tom wrote:
>I am trying to use a GnuPG key without a passphrase to send *signed* 
>mails from a cron job for some non-critical, internal reporting. 
>Searching the archives did not give me the answer.

Sorry, cryptographic operations are disabled in batch mode.

I thought I had added a note to the manual about this, but I only see it 
in the "batch composition flow" section (in git).  I'll add a note to 
the "encryption and signing" section too.

-- 
Kevin J. McCarthy

Is this still the case, that cryptographic operations are disabled in
batch mode? I could not locate it in the man pages of mutt and muttrc.

What other options do we have outside of mutt on Linux?

Thanks

	matthias

-- 
Matthias Apitz, ✉ guru at unixarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub