<dcomunicacion@cof.cl>:
201.238.231.100 does not like recipient.
Remote host said: 550-Callback setup failed while verifying
<fforteza@kinetica.cl>
550-Called: 200.55.206.67
550-Sent: MAIL FROM:<>
550-Response: 530 authentication required
550-The initial connection, or a HELO or MAIL FROM:<> command was
550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards
550-RFC requirements, and stops you from receiving standard bounce
550-messages. This host does not accept mail from domains whose servers
550-refuse bounces.
550 Sender verify failed
Giving up on 201.238.231.100.