Esto es lo que me dice cuando envio un email a una cuenta de mi servidor de correo.
This message was created automatically by mail delivery software (Exim).
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
[email protected]
SMTP error from remote mailer after RCPT TO:<
[email protected]>:
host correo.dominio.com [xxx.xxx.xxx.xxx]: 550 <
[email protected]>, Recipient unknown