Is there any update on bringing DMARC and MTA-STS support to custom domains?

Also, it appears Runbox still doesn’t support DNSSEC, is there any update on this?

I don’t know about MTA-STS and DNSSEC, but DMARC works fine for my custom domain, as Runbox provides DKIM and SPF.

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Yes it seems DMARC works and it might be possible to use MTA-STS but I don’t want to risk deliverability.

DNSSEC won’t work until Runbox adds support.