We've experienced the same issues with Btinernet. A customer who we've been working closely with is fully authenticated and BT still soft bounces their mail. When you get in contact with any postmaster address they will send one reply back and then never respond again.
Here are the two addresses I've found: postmas...@btinternet.com ipmc24hrsurveillanced...@bt.com Would love to hear if anyone has any luck in talking with them. Thanks, Dickie LaFlamme / Deliverability Specialist / Dyn
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