Did you ever figure this out. We are having the exact same issue with the same 2 104.x.x.28 and 29 IPs. For us, its the sites click.mailer.clubhouseonline-e3.com, click.emailcampaigns.net, and trk.cp20.com. They all resolve to the above IPs. If I change the dns servers on my machine, it works. If I leave our internal network, it works. It's been driving me crazy.
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