Cannot Use Email from Roundmail for roselim7@roseglitter.x10.mx

[rose23chic97]

To whom it may concern:
Sent an email from personal acct to roselim7@roseglitter.x10.mx and gave the following result:

Delivery to the following recipient failed permanently:

roselim7@roseglitter.x10.mx

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 No Such User Here (state 14).

Can you please help on resolving this server issue 550. I was able to login at cpanel webmail login and no problems, however upon sending a test or receiving a test email, it creates the 550 error. Please advice what must be done.

Thank you.

[Anna]

I just tried sending to your email roselim7@roseglitter.x10.mx from our support email, as of yet I had no delivery failure of any kind. Could you please let me know if you did in fact receive the email?