"How to send an email from MIT App Inventor without connecting to any application?"
please explain:)
Here are several methods for sending an email from AppInventor:
Use the example described here using the ActivitySensor.
Start the mailer with pre-addressed message
To start the Android mailer application, use the SEND action and use the EmailAddressList property to specify a list of email addresses. Use the android.intent.extra.SUBJECT property and the android.intent.extra.TEXT properties to specify the subject, and the body of the message. In each case, starting the activity will bring up the Android mailer, and you can complete the message and then press "Send".
For instance, if you specify:
Action: android.intent.action.SEND
then starting the activity will bring up the mailer.
You can also specify the subject line and the message text with the aid of android.extra.SUBJECT and android.extra.TEXT. You can specify email addresses for recipients with the list android.intent.extra.EMAIL. For example, to send email to Santa@northpole.com, you could use:
Observe how EXTRAS is a list, where each element is itself a 2-item list (a key, value pair). For the email addresses, the value is a list of addresses (or a list of 1-address is there is only a single address).