TestCase IntEvo-002: Compose and send a message with attachment

New test case for evolution

CaseID: IntEvo-002
Purpose:
 Compose and send a message with attachment

Steps
1. Click on the new button on the toolbar
2. add the sender himself to the list of recipients in 'to' only
3. add a subject
4. add some text in the body
5. Add an attachment
6. Send the email

Result
Should open a compose mail window with the mail account on which the focus is present in the 'from' tab.
The addresses should be added to the appropriate fields
The mail should be delivered to the respective recipients. In case, the mail could not be delivered, the user should get a mail saying that it could not be delivered to those recipients
The received mail should contain text in the body in the same way that it was sent
The received mail should contain all the attachments that were sent