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NooneAtAll5 | on: Outlook.com is rejecting email from domains without DMARC
huh

maybe someone was too lazy to set up "inbound block list" and just did a total blackout instead?

cowlevel | parent
It sounds like Gmail is seeing 3000 emails a day coming from foo@bar.com, some of which are different kinds of spam, and reasonably concludes they are a spammer.