As I mentioned in the series index, on a recent Workflow project I had a few users comment to me that the text on the emails was a little too small to read. My initial reaction was that it was not possible to change the font size. However, while driving a little later, I had a thought of how I could tackle this.
The emails sent from Workflow are HTML emails, and HTML emails can have text formatting tags embedded within them.
This is a standard Workflow task assignment email which shows the same font size used on all of the emails sent by Workflow: