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I think the fact that its only a small number of provider lists (15 of 307 on your link) where the issue has arisen then it is more those directories that have an issue. I know AWS does work with them but some still block the IPs. It might be worth working with your receivers that are using those providers to also ask for the IP to be "unblocked".
I have the same issue than Deian, almost at the same time. Only mails send to a unique domain are blocked by Barracuda. The end-user company tells me that they are not using Barracuda, issue seems to come from AWS side. Quite stuck here!
Same same 25th May 2023 - sorbs.net was blocking this IP 54.240.27.115/32 So my email was going to spam folders for multiple recipients.
All migrated to Office365 now...
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