What does this finding mean?
Null MX must not coexist with normal mail exchangers.
MX and DNS result code
Null MX mixed with other MX targets
dns.mx_null_mixed
What is the next step?
Publish either Null MX alone or actual MX targets.
Please note: The result code describes a technical measurement, not a guarantee of delivery, security or legal compliance.
Content reviewed on 20.08.2026.