How to Create HTML-Based Email in Yahoo. Yahoo Mail supports both plain text and rich text (HTML) email composition. There are benefits and detriments for each method, but if you want to use ...

To create an email signature, your must first make sure your messages are composed in HTML format by default. You can then use the signatures feature to create a signature.

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4. In the Merge to Email dialog box choose Email for the To field. Next, change or enter a new subject on the Subject Line, then select HTML as the Format.