Hi Everyone,

I have a client who sends out a mailshot once a week from their server to list of about 2000 email addresses. A fair number of the recipients are on Hotmail and Live addresses. They have started getting bounce backs from some of the addresses. Here is the error message:

SNT0-MC1-F42.Snt0.hotmail.com #550 SC-002 (SNT0-MC1-F42) 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 http://mail.live.com/mail/troubleshooting.aspx#errors. ##

I want to avoid causing any system a problem and wish to know how to avoid this in the future. What parameters should I put in place?

Many Thanks