The following link provides a good explanation for Indy 9 and 10:
http://www.indyproject.org/Sockets/Blogs/RLebeau/2005_08_17_A.aspx
How the recipient's email client displays the message can vary. It's always
a good practice to send a plain text version in the message just in case.
In the case of Outlook, depending on the version, I believe that HTML is
received as an attachment.
"John Provine" <xxx@xxx.com> wrote in message
news:45d5dc9b$1@newsgroups.borland.com...
> Is it possible to put either rich text or HTML directly into an Indy
> message? If not, if I send a stream of RTF or HTML in the message, will
> Outlook display it as such to the mail recipient? I suppose I could just
> try it and see ...
