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
> _______________________________________________
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> mailop@mailop.org
> https://list.mailop.org/listinfo/mailop
>


-- 
===============================================
Russell Clemings
<rclemi...@gmail.com <russ...@clemings.com>>
===============================================
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