Cloudmark is a secure email gateway that uses fingerprinting technology to block spam. Cloudmark has a broad footprint of networks who leverage their technology including: small and international ISPs, mobile operators, hosting providers and registrars in 165 countries. Customers include EarthLink, Comcast, Cablevision, Time Warner, AT&T, Virgin Mobile, Sprint, British Telecom, Swisscom, Antel, QQ, Sohu.com, WebCentral and many others. There are more than 1.5 billion mailboxes that may be impacted by Cloudmark filtering globally.
All messages seen by Cloudmark are fingerprinted, and then are deemed 'spammy' or 'legit' based on feedback from the network. There are three main components of the filtering technology:
The primary drivers of spammy fingerprinting include hitting spam traps or generating spam complaints within the network. Practices that are likely contributors to spammy fingerprint dispositions include:
If you feel that you are being impacted by the Cloudmark blacklist please reach out to Support or follow some of our standard recommendations:
Blacklist Remediation (comprehensive)
Thank you Carmi Lopez-Jones for helping craft this post!
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