Forwaholic
Someone who sees fit to forward you every stupid joke, falsified political quote or conspiracy, emotional cheeseball powerpoint show, extremely important safety alert, and annoying chain letter that they receive, thinking that you're interested in that garbage. Luckily, they're also clogging up their own Sent Items folders & will hopefuly crash their own systems soon.
"My uncle is the biggest forwaholic I know. I especially love the chain letters he sends me saying I hate God or America if I don't forward it on."