Successful Mail Delivery Report

Rebote:

De: Mail Delivery System [mailto:MAILER-DAEMON@mail.domain.cl]
Enviado el: martes, 25 de septiembre de 2012 16:17
Para: user@domain.cl
Asunto: Successful Mail Delivery Report

This is the mail system at host mail.domain.cl.

Your message was successfully delivered to the destination(s) listed
below. If the message was delivered to mailbox you will receive no further
notifications. Otherwise you may still receive notifications of mail
delivery errors from other systems.

The mail system

<user@domain.cl>: alias expanded

Solución:

[zimbra@zimbra-proxy ~]$ postconf -e "smtpd_discard_ehlo_keywords=silent-discard, dsn" 

[zimbra@zimbra-proxy ~]$ zmmtactl restart