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Issue Null MX Record in PowerDNS plugin

Summary

According to the RFC 7505 we have to create a NULL Record to indicate that the domain doesn't accept an email
If we create that Null Record the entire zone is returning ServFail
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Steps to reproduce

  1. Create a new MX
  2. Hostname = Your domain
  3. Mail server hostname = .
  4. Priority = 0
  5. TTL = 60

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Correct behaviour

The zone should be reachable without error
And the MX record should look like this :
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Environment

  • Server OS + version: Debian 11
  • ISPConfig version: 3.2.9
  • PowerDNS : 4.4.1-1 & 4.5.4-1pdns.buster image

Solution

For test purpose I've manually added the "." in the content field of Powerdns database, and it works.

References

https://datatracker.ietf.org/doc/html/rfc7505#page-3