Email from (a lawyer) does not reach hotmail accounts


  • I'm a webadmin and I manage; my client is a lawyer based in Miami, FL.

    He runs a business with several of his associates and they all use  email to communicate with clients. Gmail, Yahoo mail, and most other email providers receive our email but hotmail does not. Here is a sample of an error he got while running a test of his own.

    Here's a small piece of the error email. I can provide the full test email including headers. The content of the email was not in any way special, just a subject title and a line of content.


    From: Mail Delivery System []
    Sent: Friday, March 25, 2011 3:09 PM
    Subject: Mail delivery failed: returning message to sender

    This message was created automatically by mail delivery software.

    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:
       SMTP error from remote mail server after MAIL
    FROM:<> SIZE=4764:
       host []: 550 SC-001 Unfortunately, messages
    from 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

    Friday, March 25, 2011 9:21 PM