Within the DeliveryByEMail within a survey, enter a different transform to changes what gets sent:

email-full
The entire survey result DOM is included as literal XML directly within the body of the message. Any UPLOADS are treated as attachments.
email
Selected portions of the result DOM are included within the body of the message using standardized element names for questions/answers. Any UPLOADS are treated as attachments.
email-html
An HTML table becomes the body of the message, with each question defining a new row. Any UPLOADS are treated as attachments.
email-text
The body text is read from an HTML chunk within the survey that has the title "email-text".

Remember to change the mime type to "text/html" if formatted html is to be delivered.