I continue to have this issue. Although I can't say it's all. "maine.rr.com" and "roadrunner.com". I discovered it when I myself didn't get a campaign email. Found I was suspended. Two months in a row. Your customer support cleared that each time. The second time I looked closer at my bounce list and 27 suspended. All TW/Spectrum. When I pressed the support agent why this is happening, I was told it was a TW/Spectrum issue. I managed to find some time today to do some research and found this thread.
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