I have a Problem.

Emails send mails from  potero@inmobiliarianova.cl to  c.penaylillo@mciservicios.cl are  rejected by destination.

Here the error message.

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:

  c.penaylillo@mciservicios.cl
    host mx.zoho.com [165.254.167.50]
    SMTP error from
remote mail server after RCPT
TO:<c.penaylillo@mciservicios.cl>:
    541 5.4.1 Mail rejected by destination

Regards

Osvaldo