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I'm curious to know what type of customer you have? My customer base is made up of quite a few less tech-savvy types and we get a lot of issues with spam for AOL and MSN accounts.

And I don't show any bounces either. Stuff getting sent to spam doesn't give you a bounce message usually. It will appear to have been delivered successfully.

As for needing to warm up the IP, I think there is still something to that. I am surprised you were able to just start right off sending large volume. My guess would be that that you lucked out and got a gently used IP address by chance. The fact that it was on a blacklist would indicate that it probably was previously used rather heavily... just enough to get blacklisted at one place. But not abused in a way that got it blacklisted other places.

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