The text is probably being converted to an image. You need to use web fonts
and you need to mark the option to not send as an image.
There are many print formats that simply don't translate into html. Unless
you keep it really simple, you are likely to
have formatting issues in a Publisher email message. Web media is very
different than print media...you have to design accordingly. Pay particular
attention to the Tips for 2003 for more about formatting conflicts.
Create and send e-mail publications by using Publisher 2007:
http://office.microsoft.com/en-us/publisher/HA102200511033.aspx
Tips and troubleshooting for sending a publication page as an e-mail message
(2003):
http://office.microsoft.com/en-us/publisher/HP010390591033.aspx?pid=CH062524821033
PDFs may not be your first choice, but they are safe, small file size and
your font choice and other print formats will survive the conversion and
probably look better. Probably the best choice.
DavidF