1. Return Path - https://www.senderscore.org/blacklistlookup/
2. Spamhaus - http://www.spamhaus.org/
3. SURBL - http://www.surbl.org/surbl-analysis
4. MXToolBox - http://mxtoolbox.com/blacklists.aspx
Manage your delivering practices to reduce your complaints. You can do this by giving a clear description about what your email will be containing and included an opt-in process to ensure that users want to receive your email. Once you are sending, do not send materials that are unrelated to what the subscriber requested to receive and mange your unsubscribed users request within 24hours and remove hard bounces frequently.