rspamd: trusted ARC signers
Feature Request: Add to the UI a way to specify trusted ARC signers (rspamd whitelisted_signers_map setting). Ideally we could allow individual domain owners to specify what signers are trusted when mailing their domain, but it may have to be a server/system wide setting, I've not dug into the details).
This will help improve mail authentication for mail forwarded to an ISPConfig system, if the forwarder breaks DMARC (spf usually breaks, DKIM breaks if headers/body/sender is changed) but ARC signed the message that they received, rspamd can ignore the DMARC failure and consider the message authenticated. This feature allows the server/domain admin to specify what ARC forwarders should be trusted.