Al enviar correo desde un servidor exchange 2003 hacia hotmail recibo el siguiente mensaje:
There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<ecosistemas.com.ar #5.5.0 smtp;550 SC-001 (SNT0-MC4-F21) Unfortunately, messages from 200.123.172.197 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.>