One thing we need to avoid as an email marketer or a Deliverability expert are Blacklists, these are lists which can either block or limit your marketing campaigns. Blacklists are there to help police the email marketing world, and to ensure abusers are punished or held into account based on their activities. There are several types of Blacklists, such as domain blacklists, IP blacklists.
A good resource to use to see if your listed on any of the blacklists is debouncer.com another resource to use is MX tool box which can help you run these queries. In addition you can use is ‘whatismyipaddress‘