This is an error related to email.
If you write to an address that does not exist, you will receive a return message saying “550 No Such User Here”, which translated means that this user does not exist.
This error does not indicate any type of problem in your hosting service. This is an informative email that explains that the email you are writing to does not exist.
Most likely, it existed in the past, but for some reason, the domain administrator has removed it.
