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AFAIK as close as you can get is PinePhone or Librem5. But both have pretty poor battery life, an IPS display (technically could be OLED at the expense of even more battery consumption), and pretty jank camera (drivers for good cameras are proprietary, and a lot of modern smartphones rely on postprocessing for quality too).
Don’t get me wrong, PinePhone made fantastic progress in 6 years, but your experience may vary (some people use it as a daily smartphone, some as a dumb phone, others are just turned off immediately)
Mailbox.org
Mailbox Standard compared to ProtonMail Plus: