Who can’t use a blocklist?

Generally said, anyone who does not run their own mail system can’t use a blocklist.
It’s also not possible for companies that outsourced their mail scanning to a 3rd party cloud-based shared platform (Microsoft 365, Google Workspace, Mimecast, Proofpoint, etc.)
It’s difficult to apply blocklists for single tenants on a shared system, they have to be used for all tenants.

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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.