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Some standard DNS entries such as DKIM, DMARC, SPF and MX cannot be deleted, but can be deactivated.
The deactivation is done by the following settings. Please simply adjust the existing entries:

DKIM: Set entry to .
Replace the value ‘CNAME’ with ‘. For example, firestorm1._domainkey.firestorm.ch must be changed to . DKIM with our key will then no longer work.

DMARC: v=DMARC1; p=none;
Sets the DMARC policy to “none”, which means that no measures are applied in the event of failed checks.

SPF: v=spf1 +all
All mail servers are explicitly allowed.

MX: Set entry to .
This completely deactivates mail reception, as no deliverable mail domain is defined – this DNS entry is also RFC-compliant.

Note: These settings technically deactivate the DNS entries, although they remain visible in the DNS zone.
Tip: A template can be used to automatically create new zones with the desired DNS entries. Then you do not have to constantly adjust the entries.