Workflow automation for received emails
A great feature for the future would be a workflow automation, which creates a new activity once an email with a predefined subject is received. The predefined subject would be easy to implement, since a template can be used for the email sent. Email sent and email received will then have the same subject and the activity will be triggered.
An imaginable use case: email with subject "Contract" is sent to customer. Customer sends back signed contract by replying to mail with subject "Contract". Activity to check contract is created automatically.