I am a mobile game developer, and have a specific need regarding the answers I give to my users emails:
I want to be able to select several emails from my Inbox (filtering them by tag or a keyword in the body, e.g. "German"), and send the same answer to every one of the senders (e.g. "Hi, the German version is out"), preferably in separate messages (one per user).
This feature is unavailable in all the clients I have tried: Gmail's webmail, Thunderbird and Postbox.
Another need is to be able to send "Canned responses" to frequently asked questions. This feature is already offered by Gmail labs.
Is there any Windows email client, or Thunderbird plugin, that supports both of these needs ?