So I recently moved to KH and ever since I've been having multiple emailing issues. Atfirst all my emails sent to gmail and yahoo were getting filtered as spam along with microsoft and aol blocking them completely. On top of that apparently my new server's IPs were on multiple spam blacklists... After about a week of wrestling with this issue, we've now resolved all of them except for Microsoft blocking my emails. They've unblocked me multiple times (3), only to reblock me couple days after. The error message returned by them is: host mx1.hotmail.com [220.127.116.11]: 550 OU-002 (SNT004-MC4F31) Unfortunately, messages from 18.104.22.168 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. Looking that error up on their site shows: Mail rejected by Outlook.com for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an email/network admin please contact your Email/Internet Service Provider for help. Basically, the issue seems to still revolve around my new server's IPs having a bad reputation because of it's previous owners. What can I do about this? Is it some other problem?