Hi Rolf,
You can if you modify the Email - POP3/SMTP Business Object. Go to Send Message Action and open the Code tab. Search for the code below and add the line where the arrow points to. This enables all HTML formatting of the body message.
using(MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(From);
mail.To.Add(new MailAddress(To));
mail.Subject = Subject;
-----> mail.IsBodyHtml = true;
mail.Body = Body;