If you use Microsoft Outlook as your e-mail client, there are various problems with hypertext markup language (HTML) e-mails. Microsoft Outlook 2007 and Microsoft Outlook 2010 replaced the traditional web-rendered HTML support, in favour of HTML rendered by Microsoft Word. This means that all text formatting is, by default, rich text format, and so you cannot write proper HTML. The marquee tag is not replicable in Outlook 2007 and 2010. If you use Microsoft Outlook 2003, however, then you can use it.
Open Outlook 2003.
Click Tools" and "Options." Click "Mail Format." Click the "Compose" drop-down and select "HTML." Deselect "Use Microsoft Office Word 2003 to edit e-mail messages" and click "Apply."
Type the rest of your e-mail in HTML, then add the following marquee code (replacing the embedded code):
<marquee>This text will scroll</marquee>