The FlyerTalk Newsletter I receive is rendered in the tiniest font ever. Even with readers and turning my phone sideways, I cannot read the font without pinching and scrolling. I don't know if this site can be rendered in HTML3 and CSS3 but that would maybe be a constructive step to take.
Thank you for asking about this topic, BTW. It demonstrates you care about who accesses the site and how, although Google Analytics should be able to provide that to the site administrator.