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nbernard | on: Outlook.com is rejecting email from domains without DMARC
Alt take: Using a Microsoft-hosted email service is a big mistake in 2026...
bigstrat2003 | parent
That may be so, but you can't control what mail service your recipients use. So whether or not it's a bad idea, it can be your problem. That said I don't agree with OP that self-hosting mail is a bad idea.
nekusar | root | parent
Yes you can.

User signs up, uses @outlook. Your app declines it and explains that they block with no way to remedy, and explain they are a bad vendor.

Scharkenberg | root | parent | next
Deeply unserious take.
cowlevel | root | parent | next
Seems to work for many websites. But only if your users aren't giving you money, because it's 50/50 whether they'll use a different email address or give up entirely.
nekusar | root | parent
As unserious as you claim, we had this exact problem.

Emails would be accepted by Outlook.com, but would never deliver. We had SPF/DKIM/DMARC and full reporting. They RBL'ed us with no remedy.

We told the customer to not use outlook.com BECAUSE we told them we could not guarantee any delivery of messages.

ethin | root | parent
Lol if you do that, your service is just going to have a small minority of people and most people will just not bother using your app/service entirely
cowlevel | root | parent
Most people aren't using Outlook. If your users mostly are, then this solution doesn't work for you. But it does work for many people.