MX records, local configuration error

I cannot seem to work this one out.

Client is using zoneedit for DNS because he is a reseller and does not want to use our DNS.

Now I cannot send mail to him. Nobody can. The error I get back when trying to send him mail is:

config error: mail loops back to me (MX problem?)
554 5.3.5 ... Local configuration error

As far as I know he can SEND mail just fine.

He has full dns/mx settings at zoneedit. He gave me his pw and I checked/corrected myself.
mail.hisdomain.com --->IP address
domainname -->mail is send to -->mail.hisdomain.com

Same setup on my server as well.

Somewhere I am going wrong thoug MX records, local configuration error

 

 

 

 

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