Yep, that's what most people are getting. We did get a response from MS, but their response was that we did not qualify to be unblocked because we continue to be a large source of spam and phishing email. You'll need to purchase a dedicated IP if you want to be able to email Microsoft's users. They're the only one that's extremely stubborn like this. Yahoo is hit or miss, but should work if your recipient white-lists the sending address. AOL and Gmail do accept our email, however you need to be careful especially with the AOL addresses. Their filter is very sensitive and also rather abuse-report-happy. If your email looks too much like spam, they send us a report and we suspend you for spam. Gmail just delivers the message to the spam bin when appropriate without telling us.