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by technion 39 days ago
I'm reading the ZeroBounce docs and it seems very relevant. Look at this step:

"We recheck all unknown emails using IPs from different geographical locations". This matches exactly what this article describes as getting these emails from a range of locations.

The step before that is just "Proprietary Technology", which sounds like a good cover for what's going on here. How else are you testing an email address after between "real time SMTP server check"?