The RMail Register Reply service option enables the sender to receive proof of content & time of the recipient's reply. 

Messages sent with the Register Reply option will cause the recipient’s reply email to also be sent as a Registered Email™ message without any special software or account set up required by the recipient.

This feature may be selected if a user would like to allow the reply to the email to come back to the original sender as a Registered Email message.

1. The recipient only presses the ‘Reply’ button on their mail program. No setup required. 
2. The original sender receives a Registered Receipt for both the email sent and the reply email. 
3. The user that is replying to the original message does not receive a Registered Receipt message. 
4. If a message was sent using the “Unmarked” feature, the registered reply email is returned to the recipient without any banner or markings. 
5. If the original message was sent “Marked as a Registered Email™ message”, the following text is added below the banner, “Your reply will be returned as a Registered Email message.” 
6. The Registered Receipt email returned to the original sender for the register replied email contains the information of both the email sent and the reply. 
7. The Register Reply message is counted towards the sender’s usage plan. 
8. The service works by changing the “Reply To” address to an address with a hash routing the email back to the original sender and associating it to the original email sent.

For further information please see the video below: