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What's the best open-source email app?
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this post was submitted on 22 Jan 2026
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I don't know about "best" but on Android I've been using the K-9 mail app for years without problems. Supports multiple email accounts as well as standard IMAP/SMTP email protocols which is all I really need. The project was merged with Thunderbird so now it's Thunderbird for Android.
source: https://github.com/thunderbird/thunderbird-android