Well heres all you have to do.
Imagine a chain linking the message to its previous source.
Physically bring your arms up and break the chain, as if it was physically there. Doing so is like trying to physically break a cord and could take some effort.
Usually completing a chain mail request will have a good effect, however its a stupid curse that must be eradicated. If you try and find the original source you probably won't find it, chain-mail can be pretty old. Also this spell actually works. (My moms still alive, and I haven't had any bad luck)