The next phase of the #SaveShadowhunters campaign is to send post cards. This is being backed by ShumDario News, Basic Shadowhunters Stuff and Bane & Lewis and they have set up a document that explains how to do this (step by step) credited to @theswandive. (No international fees).
Check out their plan of action on sending post cards by clicking following this link.
Find the Artwork to use for your post cards by following this link: