Yes, it is possible to spy on someone's email on an Android phone without rooting it, but you must have spying software for cellphones in order to view Gmail emails that have been sent and received.
Installing SPY24 email spying software on the target Android cellphone or tablet device and using it to monitor emails are both options.
When the target device is connected to the internet and receiving emails, it allows users to read emails, take screenshots, and record live Android screens in order to record movies.