Removal of company website from Blacklist list on domain name servers

A while ago our website was hacked - Whilst the website has been rebuilt and security upgraded we have been blacklisted on many domain name servers.
This project is to upgrade our reputation and remove our website from as many domain name servers as possible in order for our email traffic to get where it needs to be
You can check that our website is genuine before applying for this project -
www.paultaylorelectricals.co.uk