> Mozilla Mail

Aren't they already moving towards this? The Thunderbird team recently announced ThunderMail which will have an optional $9/year plan.

https://www.tb.pro/en-US/thundermail/

> Thunderbird for iOS

https://blog.thunderbird.net/2025/10/state-of-the-bird-2024-...

> We’ve also seen the overwhelming demand to build a version of Thunderbird for the iOS community. Unlike the Android app, the iOS app is being built from the ground up.