This used to be called "canned responses"
- In Gmail, click the Gear icon, then click 'Settings'.
- Click the tab that says 'Advanced'.
- Click 'Enable' on the 'Templates' prompt.
- Start a new email by clicking 'Compose' in the upper left-hand corner of your inbox.
- Type the email message you'd like to save as a template.
- Click the three dots icon on the bottom right-hand corner of the compose window, hover over 'Templates,' 'Save draft as template,' and then click 'Save as new template'.
- Name your template.
- Start a new email by clicking 'Compose' in the upper left-hand corner of your inbox.
- Click the three dots icon on the bottom right-hand corner of the compose window, hover over 'Templates,' then click on the template name.
- After the response is pasted, add your recipient and click 'Send'.