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I take my hat off to you - an impressive amount of research went into this!

MessageMyWay is opt-in and has a robust opt-out mechanism - and is sadly moribund. It sends a maximum of a couple of hundred emails a day.

And we are registered with GMail spam feedback loop and Microsoft's SNDS, both of which tell us when someone marks a message as spam. This happens less than once a week, so this isn't the signal that triggers the rate-limiting.

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If you're being rate limited your mail is probably going to the spam folder for a lot of people anyway, and/or are going to accounts that are no longer active. It's not the absolute number of spam reports that matters it's the ratio.

Unfortunately if that's not the reason then shrugs I guess. Another usual reason is too few emails - this is worse for Microsoft's but I also heard that Google's filters prefer higher volumes.

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