Remote system no longer responding

Router: No message transffered to …via SMTPRouter: Error transffering message via SMTP to … 554<mail.sanarc.com[221.120.97.178]>: Client host rejected: Access denied

Router: No message to… <host…> via SMTP: Remote system no longer responding

Somebody please help me to solve the problem

Shahedur Rashid

Subject: Remote system no longer responding

It may be the problem of receiving server ,either it is rejecting your domain or above error will be for wrong email address