Step 1: In the bottom-left corner, select the little circle with your initials > Settings.

Step 2: In the Settings page, scroll down to Account and select Mail > Smart Mail

Step 3: In the Email Greeting and Email Signature text boxes, enter any default text that you want to appear on all emails.

In Email Greeting, you can use any of the tags [honorific], [first name], [last name]. Entering any of these tags in the text boxes will automatically customize the tags according to the recipient of the email.

Step 4: Select Save Changes.