Build an app to send emails via webmail

We want an app built that will send emails 1 at a time through the gmail webmail interface, the way a human would. It must not use SMTP. It should insert the To: address, subject line, and email body from a Google Drive spreadsheet. It should have a settings page with an option to set a daily sending limit, and a setting to tell the app to send emails at a random time interval between X and X number of seconds. Deadline: 5 days Budget: $40-$50