I am on an iPad Pro running iPad OS 13.2.3 and using the included Mail app from Apple.
I have disabled auto-capitaliztion globally by going to Settings -> General -> Keyboard and flipping the switch next to "Auto-capitalization". However, it is still auto-capitalizing inside the Mail app. This behavior has continued after force-quitting the app, restarting the iPad and reopening the app.
Apple Support is telling me that it is impossible to disable auto-capitalization after a period within the Mail app. I am a biologist and need to be able to type things like "E. coli" without the "c" being capitalized. Is this truly impossible? Do I need to use a third-party Mail app just for this?