"Tell that to the next corner-office stuffed shirt who doesn't think email marketing pays off.

That $15.50 per email-marketing dollar spent is roughly 17% more than in direct-mail campaigns and 73% more than telemarketing campaigns, according to a new study from the Winterberry Group, a New York-based research and consulting group.

Winterberry also predicts that email sales will go up to $16.70 per dollar in the coming year, compared to $14.60 generated per DM dollar, and $9.71 in sales per telemarketing-campaign dollar.

(We got these numbers from an Internet Retailer story, which you can read here, but we should be getting more detailed numbers soon, so check back for an update.)"