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I'm fine with providers imposing some default level of spam protection but as a user I'd like the option to disable it, even better if I can disable it per domain or sender. The old technique of adding the sender to your contacts doesn't work reliably anymore.
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"The old technique of adding the sender to your contacts doesn't work reliably anymore."

An Outlook user first reaching out to you, and you replying and including the unique message-ID of their original envelope in your headers, doesn't affect anything either. Absurd. The whole situation is complete dog shit.

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"First time?"

It's not months it's years.

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Anecdotal. I've self-hosted for many years but didn't run into these issues with O365 until this year. But not surprised to hear it.
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