I have added some features related to my own use. I would welcome any suggestions for improvement.
Features in short:
- Send message to multiple recipients.
- To and Cc options are available like e-mail.
- Reply to (Sender, All or Selected recipients).
- Message Forwarding.
- Recipient search and auto suggestion.
- Delete a message on long press
- Pop-up for new message
We are subjected to the limits of Android application. Sending over 100 messages per hour is Android application limit! You can easily cross this limit. So don't get angry if the software acts weirdly when you are sending massive amounts of messages.