I love how many of comments on this article have no idea who Brad Feld is, and nobody bothered to read his bio before deciding he's a spammer. He's one of the more famous tech entrepreneurs and investors. He's had companies acquired, sits on the board of a bunch of big companies, and runs TechStars. Networking is his job, and he's been doing it for over 20 years. If he wanted to run a spam newsletter (which he has no reason to do), he has the resources to use something way better than Gmail. ;)