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Why does your tool have a different result than a blocklist provider's site?

Discrepancies between Blocklist/Blacklist sites and MxToolbox are normal

This is not a bug, but merely a result of DNS propagation. Our tool queries the blocklist provider's DNS servers and returns the results. Sometimes a list will update DNS before or after their Web interface, which can provide different results.  In rare cases, the blocklist provider may have an internal synchronization issue that makes this discrepancy appear and disappear.

Our tool acts in the same manner that a receiving mail server would, so if you see results on our tool, your mail delivery might be being impacted.