Good afternoon Amy-1993,
Welcome to the Apple Support Communities!
Congratulations on the getting the iPhone 14 Pro Max!
It sounds like you have set the iPhone up, updated to iOS 16.1.1 (is that what you mean by latest?) and enabled Notifications. You are hearing a sound for texts (is this the Messages app?) but not email (is this the native Mail app?)
We are happy to help with the issue you are having with sound notifications.
The first thing we would suggest is to quit the Mail app, and turn off all notifications on your iPhone. Then force restart the iPhone and turn the notifications on again. This initial troubleshooting step will refresh the iOS and the Mail app as well as your connection to your Wi-Fi or cellular network.
Close an app on your iPhone or iPod touch
Force restart iPhone - iPhone User Guide
Use notifications on your iPhone or iPad
After making these changes and restarting the iPhone, send yourself an email to test.
If these initial troubleshooting steps don't resolve the issue, please reply back and we'll continue until we find a solution.
Take care.