If you want to send an email as HTML, you can do so by adding a content-type header.

<?php
 
$content = <<< EMC
<h1>Hello World</h1>an HTML email
Shwoing how the content can be sent
as a web page.
EMC;
 
$extras = "From: Graham Ellis \n";
$extras .= "Reply-to: Graham Ellis \n";
mail("graham@sheepbingo.co.uk","Web page in HTML Demo (control)",
$content,$extras);
 
$extras .= "Content-type: text/html\n";
mail("graham@sheepbingo.co.uk","Web page in HTML Demo (working)",
$content,$extras);
 
?>

Without the extra line, the email views like so:



But with it, I got



A whole host of extra considerations here - you might light to look at multipart emails (the sort that use several types in the same transmission - giving users the option of viewing as plain text - example). You need to consider how your recipients spam filters differently handle HTML to plain text emails, and indeed whether what you're sending is really necessary or could be considered to be spam.

Edit / note added - It's been pointed out to me that I mis-spelled the word "showing" and then compounded the problem by putting up a screen capture with the word mis-spelt. I'm allowing myself to take the view that showing a typing error in both the source and the resut isn't ENTIRELY bad as it confirms that the screen capture really are the result of my sources!
(written 2007-04-30 05:31:49)

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Cheat Sheet / Check list for Expect maintainers
May day 2007 in pictures
Traffic light control for horses
Smoking, or no? The law insists we spell out the obvious
Emailing as HTML (Web Page) - PHP example
Moving out some of the web site bloat
Leaning tower of Cheeser
Back button - ensuring order are not submitted twice (PHP)
Extended Credit request - train in June and be paid in September
Grand Central Station