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I am helping someone setup there DNS for a .biz domain name, as they unable to change nameservers
I told them to setup an A Record to point to the server IP, that works fine
However I told them to put the same IP for the MX Record and, I checked it at introdns.com and it says:
ERROR: Some of your MX records returned by your nameservers are IP addresses. This is not ok per the RFCs and you should change them.
The problem records are:
This can cause problems !
What should they put for there MX Record ?
You should set the MX as follows.
domain.com. 14400 IN MX 0 domain.com.