bigstrat2003 a day ago

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.

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nekusar a day ago | 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.

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Scharkenberg a day ago | parent | next [-]

Deeply unserious take.

	▲	nekusar a day ago \| parent \| next [-]
		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.
	▲	cowlevel a day ago \| parent \| prev [-]
		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.

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ethin a day ago | parent | prev [-]

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 a day ago \| 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.