limited font sizes

In trying to find why eM Client has a problem formatting my Signature line, I’ve discovered that I can’t make my font the size I want, i.e.  I want 11 pt, but it only allows 10 or 12.  Why is this?

Hello David, this is unfortunately due to a couple of standard text sizes that email communication allows. Default HTML font sizes do not include a text-size 11, but only 10 and 12 … also others…
Text-size 11 has to be formatted using CSS code and add other properties to the text to make the text appear as 11, we’re currently not supporting these properties for the standard text, however we’re working on improving this for future releases.