Based on feedback gathered from our customers, I would like to request that “Arial” be included as one of the default text styles in Gmail. Many of our clients use Arial as their official corporate font, and having it available as a default option would greatly benefit their workflow.
In Gmail, “Sans Serif” is Arial. I know it sounds a bit odd, but “Sans Serif” is the technical category Arial belongs to. In the Gmail interface:
Sans Serif = Arial
Serif = Times New Roman
Fixed Width = Courier New
So, if your clients select Sans Serif from that dropdown in your screenshot, they are actually using Arial. When the recipient receives the email, their computer will read that “Sans Serif” tag and display it as Arial (which is the standard default for almost every web browser and email client in the world).