Replying to Emails
1. Open
Email.
2. Open the email you want to reply to and touch 
To reply to all recipients of the original email, touch 
3. After drafting your message, touch
to send the email.
Configuring fast responses: Touch
> Settings. Select an account and touch Quick responses to create or edit a fast response.
Questions about your Huawei Mate 10? Post in the comments!
Huawei Mate 10 Manual [PDF]