Attention user name mrkva

[EL34]

Your email address is no good
Your registration will be rejected

Delivery attempt from MAG: smtp687.redcondor.net to receiving MTA failed. 
----- The following addresses had permanent fatal errors ----- <mrkva28028969@gmail.com> 550-5.1.1 
The email account that you tried to reach does not exist. 
Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. 
Learn more at 550 5.1.1  https://support.google.com/mail/?p=NoSuchUser r10si18982115itc.109 - gsmtp