title: NOQUEUE: reject: RCPT from unknown 454 4.7.1 Relay access denied
body: <p>Configured Postfix With Sendgrid. When I send mail from server i.e.root user mails are sending . but I login using mail client like thunderbird and send mail that time mails are not sending . getting error in 'RCPT from unknown 454 4.7.1  Relay access denied' .</p>