HTC One E8 - Manual (Page 145)

3. Do one of the following:
§ If you're replying to the sender or you selected Reply all, enter your reply message.
§ If you selected Forward, specify the message recipients.
Tap Respond inline if you want to interleave your new message with the received email. But this
removes any attachments or formatting in the original email message.
4. Tap to send.
145 Email