When a Spamhaus check reveals that you are on a Spamhaus blocklist (also known as a blacklist), what should you do? The Spamhaus Project maintains a few different blocklists, such as the Spamhaus SBL and the DBL, and for each Spamhaus blocklist removal entails a couple of steps which may differ between the lists, but which are similar and not difficult. Note that most of these blocklists are DNSBLs (DNS-based blocklists), which means that what gets listed on them is IP addresses, specifically IP addresses demonstrated to be the sources of spam.

https://www.isipp.com/blog/what-to-do-when-a-spamhaus-check-shows-you-are-on-a-spamhaus-blocklist/

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