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If you can't open the HTML file in your browser for some reason, copying the HTML's body text and pasting it into your email's source code will also work as long as you're using Gmail in Google Chrome. You'll need to copy all of the body text—including the "<body>" and "</body>" tags—but Gmail will cover the document type and the HTML tags themselves, so you don't need to copy those. This is the only browser in which you can successfully paste your HTML code into your Gmail email. Go to https://www.gmail.com/ in Chrome's address bar, then enter your email address and password if prompted to log in. It's in the top-left corner of the Gmail window. A pop-up window will appear in the middle of the Gmail window. If you're using the new version of Gmail, you'll click Compose here. Type a recipient's email address into the "To" text box at the top of the "Compose" window, then add a subject in the text box below it. In the main section of the "Compose" window, type in a string of asterisks, zeroes, or other similarly distinguishable text. This will help you find the necessary location in the source code. Select your placeholder text, then right-click (or Control-click on a Mac) the text and click Inspect in the resulting drop-down menu. You should see a pop-out window appear on the right side of the page. Right-click (or Control-click on a Mac) the blue-highlighted code at the top of the pop-out window, then click Edit as HTML in the resulting drop-down menu. Scroll down until you find the placeholder text that you entered into your email, then click and drag your mouse cursor across the placeholder text. Make sure you don't select anything to the left or right of your placeholder text. Press Ctrl+V (Windows) or ⌘ Command+V (Mac) to do so. You should see the HTML for your project appear in the window. Click the X in the top-right corner of the "Inspect" pop-out window to close it. In the Gmail window, look at your email's presentation. If you're satisfied with the way the HTML page looks in your "Compose" window, you can click Send to deliver it to your recipient(s).

Summary:
Copy your HTML email's body text. Open  Google Chrome. Open Gmail. Click COMPOSE. Add a recipient and a subject. Enter placeholder text. Open an "Inspect" window. Open the selected code for editing. Find your placeholder text, then select it. Paste in your HTML. Exit the pop-out menu. Review and send your email.