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Thanks in advance.
If you know for sure they will display html, then you can change all the < and > to < and >. Another posibility is to send a graphical display of the code. Also, many times a link is provided to view the code on the senders web site to ensure the proper rendering.
The first thing I would do is go to my favorite search engine and search for 'html emails' or something along those lines and do some real research on this before you make any final steps.
Be sure you are generating an html email by specifying "HTML in email" in your email client OR by adding the following to your mail headers if it's a command-line mailing program:
MIME-Version: 1.0
Content-Type: text/html; charset=US-ASCII
The charset will vary with region.