mailcow-dockerized/data/conf/sogo/custom-sogo.js

// Custom SOGo JS

// Change the visible font-size in the editor, this does not change the font of a html message by default
CKEDITOR.addCss("body {font-size: 16px !important}");

// Enable scayt by default
//CKEDITOR.config.scayt_autoStartup = true;