On Wed, Jan 17, 2024 at 20:13:13 +0000, L. Mark Stone via mailop wrote:
> Nonetheless, to be conservative, we've taken to blocking just
> @onmicrosoft.com emails for the moment (no subdomains).
It's strange you'd see anything from @onmicrosoft.com at all, as the
domain itself has no MX nor A or AAAA records, so mail shouldn't be
accepted anyway with any "reject_unknown_sender_domain" style policy.
At least we don't see @onmicrosoft.com at all in our logs, bemidst
tons of @*.onmicrosoft.com crap.
Geert
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