Check out dynamic content in action
The following shows how you would send a message using dynamic content with Mozilla Thunderbird:
- Open a Compose window:

- Compose the message:

- Send the message. Here it is in the recipient's Inbox:

- What the recipient sees:

- The sender is viewing the message in his Sent folder:

- The sender makes some changes and presses the Update Content button to update the mail message:

- The message as seen by the recipient now:
