If it is your customer that needs to print off the form on their end after they receive your email, then you should create the form as a separate .pdf file and include that .pdf file as an attachment to your email. That way, the form is a separate document independent from your email, and thus will print out without the email printing out with it.
The advantage of creating any attachment as a .pdf file is that the format of the document will look identical regardless of what operating system your recipient has (PC, Mac, Linux), which you have no way of knowing up front. That is why people use the .pdf format in lieu of just a MS Word .doc format for uses like this.
Most people have a pdf reader like the free Adobe Reader resident on their computers, so opening and printing the .pdf shouldn't be a problem. (To be on the safe side, you may want to include a link to the Adobe Reader download site in the body of your email.)
There are various free ways to create a .pdf file without having to buy the Adobe Acrobat creation software. Email me directly if you need more info about this.
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