So I just got an email sent by an IGS-featured dev through a third-party mass-mailing service begging for kickstarter pledges. I suspected IGS and contacted them. They insist they're innocent, which I honestly want to believe, but it never hurts to double-check. So, did anyone else ITT get an email from ymlp44.net today?
You can opt out of receiving those. Go to your "my account" and where it lists all of the e-mail subscriptions you just deselect the ones you do not want.
I get regular updates from PixelJam, the guys behind Constant C send the occasional e-mail and I have had a few others. I like to keep it on as I hope like with PixelJam I might get a heads up on a future game from a developer I might actually want in on.