How to de-list / release IP?
It is the resposability of the IP owner, such as ISP, to apply the IP
delist in anti-spam organization.
Before request for IP delist, the problem must be solved.
If the IP is blacklisted again and again, some anti-spam organizations will
not allow further IP removal request and put this IP in the blacklist for a longer
period.
1) Go to the RBL website that your IP is in blacklist.
2) Find the removal link in the webpage
3) Request the removal