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I've never heard of GW being sent via email. I think you have a to write a letter and send it in an addressed envelope.
you send it to whoever reported the derogatory that you are trying to get removed.
EDIT: if you have a charge-off and a collection, you would send one to ca since they are reporting the collection account, and one to oc since they reported the charge-off
I've sent all my GW letters via email. I didn't think people used regular mail anymore.