How to Get off Blocklists
To get your IP address off a blocklist:
1. Make sure that no device on your network is infected with malware and that no unauthorized traffic is going out. You don’t want to risk being put back on the blocklist again because the root problem wasn’t solved.
2. Find out where your IP address is blocklisted. There are real-time blocklist (RBL) check tools to check your mailserver IP and determine its threat level.
3. Use the IP blocklist removal tool available from each blocklist site. Each site has different ways of requesting an IP removal.