[dewey]

I know a bunch of sites who do that and the problem is usually that register emails get flagged by outlook and never arrive, causing a lot of support burden. Easier to then nudge people into the direction of Gmail or other providers that don't have these issues.

[takipsizad]

it was in the context of blocking email providers because of malicious mass signups (https://blog.pypi.org/posts/2024-06-16-prohibiting-msn-email...)