HTML will have embedded objects in the mail displayed like a web-page, plain text will not (the gifs, smilies, backgrounds, and pretty fonts are not shown, but sometimes appear as attachments). AOL would only apply, I presume, to those using AOL mail (which has unique quirks).
I myself only read E-mails in plain text. See this article:http://antivirus.about.com/od/securitytips...nttextemail.htm
which draws three important security conclusions:
1. "Plain text email does not support embedded images. Plain text email squashes web bugs."
2. "Plain text email does not support active content. Plain text email prevents email attachments from opening automatically."
3. "Plain text email provides a true WYSIWYG (What You See Is What You Get) experience. In plain text email, there are no hidden commands - the link displayed is the actual link."
Edited by jgweed, 21 May 2006 - 05:57 PM.