Hi All, Is anyone else seeing this resurfacing?
We've seen a large number of 421 Deferred - see https://ipcheck.proofpoint.com/?ip= What's odd is, it's affecting some of our best senders with very good list hygiene and great engagement, open, click and reply rates, very few bounces, little spam complaint /unsub rates, pretty strong data sourcing techniques, verifiable opt-in etc. My colleague has reached out on a few occasions but we haven't got any true answers that help us identify the root of the issue, it seems to be affecting a variety of customers good, bad and great. @Andrew - Do you remember what the resolution for your issue was? Kind regards, *Eoin Finn* HubSpot <https://www.hubspot.com/> Senior Deliverability Ops
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