Gmail Errors - aspmx.l.google.com

[TWSI]

Hello and Good Day!
I send out email daily and have had no issues, I have one email address that is returning this message? any idea's

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain xxxxxx123rols.com by aspmx.l.google.com. [2001:4860:400b:c01::1a].

The error that the other server returned was:
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/answer/6596 nx14si2286172pab.69 - gsmtp

Thanks David

[Oleg]

The email account that you tried to reach does not exist.

It seems the answer in the error message.

Something is wrong:
- target email address
- MX record of recipient mailbox (or other settings of target mailbox)