[Users] Message doesn't conform to MIME standard. It may render wrongly.

[Slavko]

Dňa 6. januára 2022 18:58:41 UTC používateľ Thomas Groman via Users <users at lists.claws-mail.org> napísal:

>I was trying to figure out the same problem. Cept I was trying to
>figure out how to configure rspamd to reject html-mime-only or mail
>that doesn't have a plaintext mine with a specific reason message.
>Unfortunately, nobody on the rspamd-users list knows how to do this
>either.

Try rspamd's force action, set in local.d/force_actions.conf:

    HTML_ONLY {
        expression = "MIME_HTML_ONLY";
        require_action = ["no action", "add header"];
        action = "reject";
    }

But i am not sure now, if MIME_HTML_ONLY symbol is added by default,
or something have to be enabled for it...

regards

Slavko