How to make a mail template
OS X - Mac Mail
If you find yourself sending emails with the same content over and over, create a template.
Open Mail, click on New Message and enter the subject.
Enter the From email address.
Create the standardized message.
Don’t include any salutation, but leave a space for it if you plan on using one.
Select Save as Stationary from the file menu.
A window will open asking you to name your new stationary. It also tells you that your new stationary (template) will be saved to the Custom section of the stationary picker.
To use your template, open Mail and select New Message.
When a new message opens, click on the Show Stationary button in the top right corner. The stationary options will open.
Scroll down to Custom and you will see your template.
Click on it and add whatever additional information you wish.