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I can't really speak to your specific issue, but recently I've noticed several of my email providers discarding verification messages that formerly arrived as expected. Just this week I have updated my whitelists at all of my email providers to include anyone who might possibly send me verification messages.
You may have already tried something like this, but at Fastmail I have a contact I just call White List to which I add all such addresses. In some cases, if I hadn't had old verification messages I would not have known what address to whitelist.
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