I'm not sure if there's something else I'm still missing but I input the below code in the <head> of my email like the Litmus link you provided suggested.
<link href="http://pages.newrez.com/rs/152-KAN-566/images/RecoletaW05-Regular.woff" rel="stylesheet" type="text/css" />
And for the fallback font, it's currently set up as font-family: SailecW05, arial, georgia, helvetica, sans-serif; but I'm not seeing the font change in my emails. So I'm not sure if there's something else that I'm missing.
I'm not sure if there's something else I'm still missing but I input the below code in the <head> of my email like the Litmus link you provided suggested.<link href="http://pages.newrez.com/rs/152-KAN-566/images/RecoletaW05-Regular.woff" rel="stylesheet" type="text/css" />
That's the URL of the binary WOFF file. If you use the <link> method it needs to point to a CSS stylesheet that in turn references the font file.