Google suspend email accounts that get lots of spam reports. It happens a couple of times a year for salespeople in my company who use Gmass (a bulk email sending tool).
I mention it only as a useful data point, and in the absence of anyone else on the thread mentioning that Google have robust email abuse monitoring.
I mention it only as a useful data point, and in the absence of anyone else on the thread mentioning that Google have robust email abuse monitoring.