[prash_ant]

I understand you can encrypt the message with gpg2 and then send the message with the CLI (perl based) script sendxmpp [1].

[1] https://packages.debian.org/bullseye/sendxmpp

[matthias_hmb]

Thanks for that hint. I added command 'r' to send a raw stanza, so a script would work like this:

BASE64_OPENPGP_MESSAGE=$(echo "message" | gpg | b64)"

echo "r <message to='[e-mail]'><openpgp xmlns='urn:xmpp:openpgp:0'>${BASE64_OPENPGP_MESSAGE}</openpgp></message>" | txmppc