Hi there, I have an ESP client that appears to be stuck in an stock reply loop with a particular postmaster issue. The issue relates to 421'ing on a specific IP, which is used by a single sender for transactional messages. They have been trying to get this looked at for nearly a month, and I'm suspecting that their case is being misclassified or something like that.
Would very much appreciate someone reaching out off-list. Thanks, Ken.
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