There are quite a few people who use Gmail in their professional lives, and for good reason. It has a great number of integrated features within Gmail for business use such as:
As well as other features useful for your personal life. There is a feature, not well published that will allow you to make form letters. Now I know that many people don't like form letters, but unfortunately hand typing the same letter to each client can often be time prohibitive in many cases. This feature is more like canned text rather than a form where you fill in the blanks, so it does have some limitations. An advantage of course is that you can easily add to the canned text once it is entered into your email so that you can personalize any thing that you wish. Here are some steps to create this form letter:
Set Up and Use Email Templates in Gmail
To enable message templates in Gmail:
Make sure "Canned Responses" is enabled. (See above.)
Compose the message in Gmail.
Do leave the signature in place if you want it to appear in messages sent using the template.
You can leave both the Subject: and To: fields empty. They are not saved together with the template. (The subject, if you enter one, is suggested for the template name, though.)
Click the More options downward-pointing triangle (▾) in the toolbar at the message's bottom.
Select Canned responses | New canned response... under Save from the menu that appears.
Type the desired name for your template.
Create a New Message or Reply Using a Template in Gmail
To send a canned message or reply:
Note that Gmail will not overwrite any existing text except if you highlight it before inserting the template's text.
Edit a Message Template in Gmail
To change a template's content: