HTML / HTML5 / CSS / Non-Browser apps like Thunderbird.

I have an app that send emails.  The body of the email can be defined as HTML.   I want to use the bgcolor attribute of <body> to set the background color of the email.  Simple enough.   http://www.w3schools.com/tags/att_body_bgcolor.asp

However, "The bgcolor attribute of <body> is deprecated in HTML 4.01."  and "The <body> bgcolor attribute is not supported in HTML5. Use CSS instead."

So, I'm using Thunderbird as my email client, which is not a browser of course.  If I use the bgcolor attribute, Thunderbird recognizes it and all is well.  

So, how do HTML / HTML5 / CSS and  non-browser apps like Thunderbird work together / or not work together?   If I use the bgcolor attribute to set the background color of the email, do I run the risk of it not working at some point in the future?  If yes, would that imply that Thunderbird no longer supported HTML 4, but instead switched to HTML5?

Thanks for any feedback.
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HLRosenbergerAsked:
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DualCoolConnect With a Mentor Commented:
use inline css
 more email clients will except the inline css rather the deprecated html bgcolor
<body style="background-color:#060;">
</body>

or you can use both
the email clients that don't support one or the other will error silently
<body bgcolor="#E6E6FA" style="background-color:#060;">
<body >
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Adrian CrabtreeConnect With a Mentor Commented:
Hi HLRosenberger,

A great guide to creating HTML emails can be found here: http://www.campaignmonitor.com/guides/coding/guidelines/.

What you can do is you inline styles to create your backgrounds, colors, etc. Here's an example:

<body style="background: #333">

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Note that creating an email for every email client will be tricky if not impossible, but the link I gave you should give you a good understanding on how to go about it the best way. More guides from Campaign Monitor can be found here: http://www.campaignmonitor.com/guides/
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HLRosenbergerAuthor Commented:
That's the ticket.  Inline CSS. Thanks!
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