1. Tap Conversations in the lower toolbar.
  2. Select the desired conversation.
  3. In the lower toolbar, you’ll see a Chat and an Email icon with a “Text reply” or “Email reply” field.

These are the “quick reply” options, which allow you to reply to messages directly from the timeline view. By default, quick reply emails will “Reply all,” so you will need to select the email itself to use other options.