Private Blocklists
This article explains private blocklists and complaint feedback loops.
In addition to 100+ public blocklists, there are several private and postmaster blocklists that can impact email delivery to recipients using clients such as Gmail, Yahoo, AOL, etc. If you find your domain or IP listed on one of these lists, it is likely that all email sent to recipients using that client will no longer receive your email until your reputation and complaint rates improve.
Also, some of these lists are different from public blacklists because they provide Email Feedback Loops, also known as Complaint Feedback Loops. These feedback loops are provided to senders with the aim of helping them reduce spam complaint rates. Each feedback loop offers senders the ability to have complaints that each client receives forwarded to them as a means to understand how recipients feel about sender's email messages and take action in reducing the volume of spam complaints those emails generate.
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Private Blocklists
Below are examples of private blocklists. Click on the headers for specific information about each private blocklist.