What exactly does this error mean and what should I start investigating?

Problem:
I have a domain that cannot recieve email on its mail email acount. That is the account cpanel sets up, usernam@domain.com. Which in this case is sklndr@sklndr.com. That address cannot recieve email, it returns to sender with the the following error:
Code: 
Technical details of failure:
PERM_FAILURE: SMTP Error (state 10): 550 to verify they are valid."
but other addresses pertaining to that acount such as admin@sklndr.com work just fine.

DnsReports.com reports that is cannot connect to the mail server:
http://dnsreport.com/tools/dnsreport...ain=sklndr.com
But why does admin@sklndr.com work just fine?


Another domain on the same server has no problem, all the email accounts work fine:
http://dnsreport.com/tools/dnsreport...htyhosting.com

 

 

 

 

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