Null MX record problem

I would like to add a Null MXrecord (as defined in ietf rfc 7505) to the dns records, but the required dot “.” is not accepted as value.

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Hi Tomas!
Thank you for the report. I created an internal issue about this.
This is an interesting point since I never considered the fallback to the A/AAAA record for mail servers so our CDN nodes might bet getting some mail traffic :smiley: