Hey all, just sharing this article. It has been discussed heavily on this list in the past about blocking onmicrosoft[.]com domains entirely - Good news, Microsoft appears to now be taking steps to curb its usage for M365 tenants.
Article: https://techcommunity.microsoft.com/blog/exchange/limiting-onmicrosoft-domain-usage-for-sending-emails/4446167 - Mark Alley
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