That's how I implemented it. It also works for mails that are sent to external recipients. However, my mails sent internally were still double-signed. As DKIM signing makes no sense in this case in my eyes, I quickly set it up so that mails to certain addresses are not signed. To do this, I created a list with the email addresses of the internal users and instructed opendkim not to sign them. This works quite well.

This is perhaps a ‘lame’ solution, but better than double-signed mails.

Am 07.03.2025 um 22:50 schrieb roughnecks via Postfix-users:

Il 07/03/2025 22:13, Wietse Venema via Postfix-users ha scritto:
By far the easiest is to stop using content_filter and to use an
rspamd milter or the like do the signing.

Thanks, but I don't want to "overturn" everything; yes I'm running
spamassassin.

ATM I just found out about:

  -o receive_override_options=no_milters

which stops the double sign.
Ran some tests, looks fine(?)
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