On servers running cPanel, you may get that mail sent to valid users is bounced back by your mail server. The bounce back messages will be similar to the following.

PERM_FAILURE: SMTP Error (state 9): 550-"The recipient cannot be verified. Please check all recipients of this 550 message to verify they are valid.

If this is occurring, you will need to check your exim_mainlog file for entries 
similar to the following:

 

H=(nf-out-0910.google.com) [IP] F=<emailid@gmail.com> rejected RCPT 
<emailAccount@domainName>: No Such User Here

 

If you are sure that email account does indeed exist, you will need to run the following commands to correct the issue.

 

/scripts/updateuserdomains
/scripts/mailperm

 

You will then also require to check your /etc/localdomains file and verify that the domain name is present. Also, verify that the DNS line in your /var/cpanel/user/username contains the domain as well.

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