build Gmail like web app using Google App Script
Hi I am trying Gmail like web app, where i can integrate this app into my existing portal(into an iframe or something) and i was wondering which API should i use. I found this google app script and the API's for composing emails, receiving emails, creating labels, deleting emails, etc. 

My Questions is can we use Google App Scripts to build Gmail like webapp.Is it possible, else can you please let me know what are the available API's to use. 
build Gmail like web app using Google App Script
===

Hi I am trying Gmail like web app, where i can integrate this app into my existing portal(into an iframe or something) and i was wondering which API should i use. I found this google app script and the API's for composing emails, receiving emails, creating labels, deleting emails, etc. 

My Questions is can we use Google App Scripts to build Gmail like webapp.Is it possible, else can you please let me know what are the available API's to use. 