Should I use more than one blocklist?
Generally said: Yes, the more filter, the better! But those vendors should be accurate, reliable, and well-supported. We wrote a blog post on this topic here. If you consider switching vendors but are still unsure, we have a comparison tool that lets you compare the effectiveness of our different blocklists (RBL/DNSBL).
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Do you want to remove your IP/domain from one of our blocklists?
Please use our lookup-service and follow the instructions there in order to get that resolved.