Functionality like gmail - user have configured e-mail signature in "desktop" version of webmail and if he use Axigen webmail on mobile device, "mobile" version is showed, where no signature is available. Gmail is adding default signature from "desktop" webmail when user is using mobile version of their webmail.

note: Our users have duties designated by law to use specified clause in every text-based communication with their clients. They must copy-paste this text on mobile devices.