Enable a dynamic identity when replying a message, by using
the original "to:" as the sender (without it being defined as an identity). As a plus, user can safe the newly defined identity if he or she prefers.
Example:
1. Order from an online store using a dynamically defined email such as onlinestore1 @ mydom.tld.
2. Receive an order confirmation sent to onlinestore1 @ mydom.tld
3. Reply to the email to inquire shipping status.
4. AquaMail automatically uses onlinestore1 @ mydom.tld as the sender identity
This would be so cool for many of us who uses dynamic email address.