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K-9 Email/Thunderbird for Android push the dates back on nearly everything
(developer.thunderbird.net)
Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
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so I misunderstood EVERYTHING. Sorry for stealing your time...
I appreciate you for putting in the effort, regardless of the outcome.