We just bumped into some spam on security SE. We mod nuked it, but I wanted to report the email address there. I found this, but it seems the person needs to have mailed you spam:
I would like to report a Gmail user who has sent messages that violate the Gmail Program Policies and/or Terms of Use.
In this case, no one received email from nor mailed the spammer.
Is there any link to report such an account?
Best Answer
This may not be specifically for email abuse, but if they have a Google+ profile associated with that email address you can report them.
On any user's Google+ profile page, just under their photograph on the left hand side, there is a drop-down for "More actions". one of those is "Report this user".
I've never reported anyone, so I don't know what sort of response you would get.