I believe FM Send Mail can only send plain text. I am not sure if there is a plugin for this...
You cannot do that if using FileMaker's built in Send Mail tool. Email sent this way is plain text only. To get formatted text in your email currently requires using an email plug in. There are a number of different ones from which you can choose. I suggest websearching them and comparing cost vs. features if this is something that you need to do.
Built in options are to either emphasize text via a change in case such as using ALL CAPITALS or to produce a PDF that you attach to the email and put your formatted output into the PDF.
look to the TextFormatting functions:
However, be aware that text in email sent from FileMaker is PLAIN regardless of the formatting you send to it. You must use another means to get "HTML/rich-text" email from FileMaker.
FileMaker Pro sends email messages as plain text. To edit the message's contents and formatting, choose to send the message through an email client and set the With dialog option to On. You can then edit the message within the email client before it is sent.
Thanks all for the quick response