Even though it looks like quite a cool service, honestly I wouldn't use them on principle.
Here's the email I received: http://i.imgur.com/Kf9Nv3F.png
On a side note, I've reported offenders to the FTC for violating CAN-SPAM, but the FTC just sends you a default reply that they don't look at individual reports for violations.
And BTW the percentage of the people who replied with "unsubscribe" was very very small compared with the people who signed up and responded with thank you emails.
Anyway I happy you think the service is cool, and we've apologised and multiple times for these emails already, so I'm not sure what we can do more?
I may be able to help explain this - I didn't get your email, but I get a lot like it for SEO, off-shore freelancing and Android services. I don't bother to reply or click the link because I figure if they do this kind of spam advertising the unsubscribe won't mean anything. I just hit "spam" and let my mail program remove them.
Well done for stopping.
We understand that it's not acceptable by some people and that's why we're going to change that.
It's also spamming. Harvesting email addresses from people contributing to open-source isn't cool. I'm glad to hear you'll be changing that.
I know it's competitive out there but your app looks good, let it speak for itself. You don't need to stoop this low.
I invite you to look at my widget!
I invite you to look at my viagra pills!
I invite you to take this unclaimed money in Nigeria!
Serious question: are you going to stop this or just change it? Some of your other messages are unclear on this point.