Sending correctly-formatted HTML email can be a more complicated process than you might think. But the free, cross-platform Thunderbird email client is a decent solution.

Step 1. Click the Write button to compose a new message:

Step 2. Click in the body of the email.

Step 3. Go to the Insert menu and choose HTML:

Step 4. Paste in your HTML code and then click the Insert button:

Step 5. You should now see a preview of your page in the body of the email:

Step 6. Click the Send button:

Step 7. Choose Send in Plain Text and HTML and click Send again:

(Made with help from Jamie Ryckman.)