What platform does clarity use for autogenerated emails? Should we be building that content and have that setup within our app programming?

Git is the latest and coolest software, and SVN is the outdated old one. When you tell SVN that you want to create a new branch of your code to have some fun, it creates a heavy weight dumb carbon copy for you. But Git is intelligent, it won't create a new copy for you instead it will only keep track of the things you're adding/removing/changing with respect to the original sources. I hope I made the point, for more let's have a telephone call some time :)

Treyedit.com is simple and easy

It always starts with the list. You mention 'non opt-in' lists, which is certainly more troublesome than any domain name. Your best course of action is to get a new domain, re-confirm the lists you have (requiring the subscriber to click through in order to stay on), and only accept confirmed opt-in lists moving forward. It will decimate your mailing list in the short term, but long-term eliminate your deliverability concerns and improve ROI.

Do you have an idea of what kind of invalid emails you are receiving? That will help you determine which vendor is the best fit for you. For example do you consider support@, info@, or postmaster@ invalid, some vendors will weed those out for you? Or are you just concerned with making sure the email has an accurate Domain/MX Record? Will blocking SPAM IP addresses be enough to address your needs, if so you need a vendor who checks agains URI DNSBLs. With that in mind, here's a good blog article about the top vendors. Best wishes! https://www.formget.com/best-email-verification-services/

You need to think about these auto-responders in terms of events. If you can put data up on MailChimp when an event takes place, you can manage auto-responders off of that data. Here is some additional information from their website. http://kb.mailchimp.com/article/how-do-i-create-an-autoresponder