If the Mail app of Windows is displaying its emails in raw HTML data or code instead of the regular readable format, follow these solutions to resolve the issue.

Combine the features and formatting of HTML e-mail with the safety of plain-text messages by designating specific senders as safe.

In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.

If you prefer viewing your Gmail account in basic HTML, you'll soon be out of luck. Google is removing Gmail's Basic HTML view and replacing it with the Standard view across the board in January ...

Google updated a Gmail support article to say that the basic HTML view for Gmail will be discontinued in January 2024.

Web sites that want to persist data should e-mail it to the user. Word, Excel, PDF and HTML attachments are directly viewable from inside iPhone’s mail app while iPhone is not on the network.