I receive message from hotmail as below:

COL004-MC3F45.hotmail.com rejected your message to the following e-mail addresses:<o:p></o:p>

COL004-MC3F45.hotmail.com gave this error:
SC-001 (COL004-MC3F45) Unfortunately, messages from 210.213.49.32 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

I've check, our IP is not on spamlist.

I've check the MX record all reply OK, except warning smtp reply a bit slow.

How can I correct this issue. Please help.

my email address are:

[Removed email addresses]

Best regards

• Edited by Melon Chen CHNMicrosoft contingent staff, Moderator Friday, June 26, 2015 2:33 AM removed email addresses