It sounds reminiscent of HelloBar although you say in your post that it isn't like HelloBar at all - bad sign. I'd also recommend saying explicitly a few of the customers you're targeting e.g. bloggers, companies with large audiences etc etc.
Good luck!
They're really optimized for "I have a user on a page, and I want them to go to X." X could be a product information page, or a page to add their email to a list. We're optimized for "I have a user on a page, and I want them to put their email on my X list so they can get my updates." where X is the name of your email marketing service. That distinction means we can get some tighter integration and a few more UX brownie points for that use case than would make sense for Hellobar to implement.
If passive email is what your product is for then you need to:
1. make the bottom bar slightly bigger
2. allow me to be able to add a picture of the lead magnet im offering
3. the bar should slide up after after 1-2 seconds
You are essentially a saas version of http://instantslideup.com/ and your target audience is BLOGGERS.
The one that's the most problematic is the image. I've struggled with a way to implement such a feature and avoid it from being gimmicky-looking. Or, rather, some up with mechanisms to prevent the user from making it look gimmicky. I'm open to any ideas/suggestions around that.