Term for person who can't figure out how to turn off the default, often-branded, signature of their email program. Most commonly email applications found on smartphones. Usually something along the lines of: "Sent from my Dingleberry(r) on the Then(c) Network"
example email post from a signatard:
"Hey, guys, i just joined this list, can anyone tell me how to post to it?!!!!!
Sent from my LamePhone(c) on the Douchey Network(r)"