Error : 550-The recipient cannot be verified

While checking the exim_mainlog, you can find the error message like:
H=(nf-out-0910.google.com) [IP] F= rejected RCPT : No
Such User Here

The bounce back error message will look like:
Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 9): 550-"The recipient cannot be verified. Please check all recip
ients of this
550 message to verify they are valid.


Please run the following to fix the issue:
/scripts/updateuserdomains
/scripts/mailperm

Also check the /etc/localdomains file and verify that the domainName is present in it. The "DNS="
line in /var/cpanel/users/userName should contain the domainName.

Note : Replace domainName, userName and emailAccount by corresponding values.