When the first domain record is a CNAME, why are MX records not allowed?

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When the first domain record is a CNAME, why are other type of records not allowed?

Updated: 2025/03/05Viewed times: 14982

If a CNAME record exists for a specific domain name, no other record type (like A, MX, TXT) can be added for that same domain name.

RFC 1034 published by the Internet Engineering Task Force (IETF) recommends the following:

"If a CNAME resource record is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different. This rule also insures that a cached CNAME can be used without checking with an authoritative server for other resource record types."

Check for a workaround for this issue.

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When the first domain record is a CNAME, why are other type of records not allowed?

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