detecting HTML based e-mail

I want to create an HTML based newsletter that is sent to users that subscribed to it. The problem is that if users do not have an HTML capable mail reader, then they can can not read the newsletter. Is there a way to autodetect if the client is capable of interpreting HTML and then send the appropriate version of the newsletter (HTML or text)?
mjara1Asked:
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jhurstCommented:
typically the way this is handled is to use a multi-part message with the html version and a plainn/text version marked as an alternate.

From: mere@here.now
Subject: your subject
Mime-Version: 1.0
Content-Type: multipart/related;
        type="multipart/alternative";
        boundary="=====================_1068495==_.REL"
Status: RO

--=====================_1068495==_.REL
Content-Type: multipart/alternative;
        boundary="=====================_1068503==_.ALT"

--=====================_1068503==_.ALT
Content-Type: text/plain; charset="us-ascii"; format=flowed

This is a special version since your mail reader
does not seem able to handle html pages

Your message here

--=====================_1068503==_.ALT
Content-Type: text/html; charset="us-ascii"
--=====================_1068503==_.ALT
Content-Type: text/html; charset="us-ascii"

<html>
html version of the message
<br>
<img src="cid:4.3.0.20000221163251.00a72290@shy.com.0" alt="Image"></html>

--=====================_1068503==_.ALT--

--=====================_1068495==_.REL
Content-Type: application/octet-stream; name="47125.$$itp"
Content-ID: <4.3.0.20000221163251.00a72290@shy.com.0>
Content-Transfer-Encoding: base64
Content-Disposition: inline; filename="image.jpg"

An image goes here
--=====================_1068495==_.REL--

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mgfranzCommented:
Nope.  What you are asking for is essentially a way to tell if the user is going to open their email in a browser based client, a POP3 type viewer, or with a telnet session.  Sorry, the only way I can suggest is to submit both in the same message, the HTML based first, then tag on the text version.  

Most MIME-aware Internet mail applications are already able to either properly format text/enriched mail or, at the very least, are able to strip out the formatting commands and display the readable text. The same is not true for HTML or SGML.  The current RFC on HTML [RFC-1866] and Internet Drafts on SGML have many features which are not necessary for Internet mail, and are missing a few capabilities that text/enriched already has.

If you are able to come up with a solution please let me know...
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