I see that many people were having this problem in 2022-2023. We have just discovered it recently. I don't know how much in use Peter Lowe's Ad and tracking server list is, but it would seem to me that Constant Contact would want to try and negotiate with them to take your servers off of their filter list. It seems likely this is affecting a large number of your customers but that many of them, like our company, have not yet discovered it. I hear your point about how you can't contact every individual domain where someone has marked Constant Contact stuff as spam, but I don't even see any report indicating that CC has attempted to reason with these people.
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