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iOS exposes an API for this

Here’s a local keyword filtering app that works great: https://github.com/afterxleep/Bouncer

I use Bouncer, but this should be a functionality given by iOS, I don't feel comfortable giving a third party app access to read my messages.

It doesn't give the app access to read your messages. The MessageFilter extension that actually handles filtering cannot communicate with any other part of the code nor the network.

https://developer.apple.com/documentation/sms_and_call_repor...

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