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Mostly, the answer is no. The IRS can certainly ask you to turn over your emails voluntarily. You may even have an interest in doing so if they prove your deductions. You also might want to hand them over to prove you weren’t behind some tax scam the IRS is pursuing.
But if push comes to shove, the IRS is unlikely to be able to get your emails from your Internet Service Provider (ISP). There’s been recent focus on this question after the IRS tried to get emails from an ISP. An IRS Revenue Officer contacted the ISP and asked for all emails from the last two years.