Lightweight Third-Party Android Mail Client With Full Exchange ActiveSync 16.1 Support For GoDaddy and M365 Refugees Locked Out of Gmail
Microsoft's March 1, 2026 EAS 16.1 enforcement broke the Gmail app's ability to authenticate Microsoft 365 and Exchange Online accounts. Tens of thousands of GoDaddy-Exchange small businesses got pushed to Outlook for Android, which is bloated, telemetry-heavy, and feels like overkill for a six-person dental office. The opening is a lean third-party Android mail client (think K-9/FairEmail UX, but with battle-tested EAS 16.1 support, calendar+contacts sync, and a clean small-business setup wizard) priced one-time so it stops feeling like Just Another Subscription.
Don't open-source it from day one. EAS 16.1 conformance is a real, ongoing engineering tax (Microsoft will keep moving the floor) and the only way to recoup it is a one-time $14.99 purchase with a small annual sync-key fee. Sell it through GoDaddy/Bluehost reseller channels because their support reps are the ones telling small businesses to 'just use Outlook' and would gladly recommend an alternative instead.
landscape (3 existing solutions)
Outlook works but is heavy. The lean open-source options don't all keep up with Microsoft's EAS version churn. The Goldilocks slot is empty.