1. qmail / DKIM

Configuring DKIM for qmail https://notes.sagredo.eu/en/qmail-notes-185/configuring-dkim-for-qmail-92.html

• January 11, 2024 by Roberto Puzzanghera

1.1. whois

Configuring qmail-remote for signing and qmail-smtpd for verification

References:

    man spawn-filter
    man dk-filter
    Writing filters (by Manvendra Bhangui)

https://www.pc-freak.net/blog/how-to-enable-domain-keys-dkim-in-qmail-toaster-based-mail-server-install-on-debian-linux/?cid=27784

https://qmailrocks.thibs.com/dkim.php

Install Debian libdkim-dev package
aptitude install libdkim-dev

Replace the original qmail-remote binary by the qmail-remote DKIM wrapper script 
from Joerg Backschues + create spool directory

qmail-remote DKIM wrapper script

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