Does CNAME affect MX records?
CNAME records must point to another domain name, never to an IP address. MX and NS records must never point to a CNAME alias. Domains that are used for e-mail may not have a CNAME record – this can have undesirable results with different mail servers.
Can MX record point to CNAME?
As stated in the IETF (Internet Engineering Task Force) RFCs (Request for Change), it is not permitted to point an MX record to an alias/ CNAME.
Does an A record override a CNAME?
Once a CNAME exists for a name, no record of any other type may exist for that same name (it’s an override for all types). this is permitted because the original type of the query was “A”, so we can include it as an answer, and it will avoid a round-trip on behalf of the recursor.
Can a MX record be used as a CNAME record?
Having an MX record for the same hostname as is defined as a CNAME record will fail in most DNS server implementations. Some older DNS servers will allow this, but they have been mostly phased out in favor of newer, more secure implementations.
Can a CNAME record point to an NS record?
Additional section processing does not include CNAME records, let alone the address records that may be associated with the canonical name derived from the alias. Thus, if an alias is used as the value of an NS or MX record, no address will be returned with the NS or MX value.
What does MX mean in a domain name?
This is a record that points to where your email is hosted. It’s the record responsible for associating your domain name with an email server. And typically, one domain name can have more than one MX record. For instance, you may decide to use Google as your email host.
Do you have to change one record with CNAME?
That way you will only have to change one record when the off-site’s IP address changes. It is the only valid and possible way, as CNAME is an alias for a complete set of records, not just A.