Adam Mosseri:
Second, threads posted by me and a few members of the Threads team will be available on other fediverse platforms like Mastodon starting this week. This test is a small but meaningful step towards making Threads interoperable with other apps using ActivityPub — we’re committed to doing this so that people can find community and engage with the content most relevant to them, no matter what app they use.
That’s not even true, I run my own mailserver for private and a business and it works like expected.
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Absolutely, Outlook.com is by far the worst in this regard. I stopped running my own mail server a few years ago because it was just unbearable.