But https://learn.microsoft.com/en-us/microsoft-365/admin/setup/domains-faq?view=o365-worldwide says:
"You can keep using the initial onmicrosoft.com domain even after you add your domain. It still works for email and other services, so it's your choice." ... or am I misunderstanding? I'm tempted to block *. onmicrosoft.com completely but I'm very afraid. On Sun, Jan 14, 2024 at 5:15 AM Graeme Fowler via mailop <mailop@mailop.org> wrote: > On 13 January 2024 14:07:46 "L. Mark Stone via mailop" <mailop@mailop.org> > wrote: > >> Is there a list of "legitimate" subdomains of onmicrosoft.com somewhere >> that we can leverage? >> > > Wearing my "I have to administer a Microsoft 365 tenancy" hat - no. > > However, your mention of best practice is bang on. The subdomains of > onmicrosoft.com are tenant boundaries and not intended to be used for > email. Domains should be added, verified and configured properly for > outbound mail. > > I would personally say that you will lose practically no real email by > rejecting those subdomains completely - and if you get complaints from > actual M365 tenant customers, point them at the docs. > > Graeme > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop > -- =============================================== Russell Clemings <rclemi...@gmail.com <russ...@clemings.com>> ===============================================
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