I\'m familiar with how to send emails via Google Apps Script (http://code.google.com/googleapps/appsscript/articles/sending_emails.html). It\'s super cool. But is there a way I
My gadget/script [1] does precisely that, you can reply to many emails at once from within your GMail account.
Basically I just used the Publish / Deploy as web app command (from the script editor) and in there set the options
Execute the app as: User accessing the web app
Who has access to the app: Anyone
Users then will be asked to authorise the script the first time they access it and they will run it from their own Google account, accessing their own Gmail.
[1] https://sites.google.com/site/replytomany/