Greetings, Torijuli.
I see that the Mail application on your iPhone won't open. When you try to view your email, it quits almost immediately. Good job in updating your phone, and I'm happy to help.
Force an app to close on your iPhone, iPad, or iPod touch -- First, force close the Mail application if it's open, then -- Restart your iPhone, iPad, or iPod touch -- Once it's returned to the Home screen, test the issue. If you've already restarted your phone with the Mail application closed, continue to the next step.
How to check the storage on your iPhone, iPad, and iPod touch -- If restarting your iPhone with the application closed didn't resolve the issue, you can offload the Mail application, then reinstall it again. Offloading the Mail application leaves your email accounts in place. Go to Settings > General > iPhone Storage, scroll to the Mail application and tap "Offload App". Once the application has been removed, reinstall it again and test.
Let me know how that goes.
Take care!