Google Apps for my domain email: Any reason we should not authenticate DKIM for our domain?

It depends on the source of the leads for the B2C. It is a very personal experience and also depends on the relationship level you have with the clients. I have clients who are very successful with a more moderate approach. We have worked out a pattern where they contact them within 5-7 business days. Their clients will not even talk to them before a minimum of 5 business days. A solid CRM system will allow your team to work towards finding a good average response time. Personally, and as a business owner, I do not want to hear back even further out. I also believe that it depends on the maturity level of your team. Age and maturity make a difference. I hope this helps.

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.

Not necessarily, if your app can potentially serve different markets with different demographics, it may be beneficial to market to each market individually. Since app interface often serves as a marketing tool, it is important that it resonates with its target audience. This means having a different interface for the same set of functionalities depending on your audience may be prudent. On the contrary, if you are simply trying to create variations of the app for a single market by short-cutting user testing and hoping that one of the interfaces will generate more interest, you are then over-saturating the market and may actually hurt yourself by creating unnecessary confusion for your users. I would suggest looking into what other apps your target audience is using and working off that to create a single user experience which would resonate with them. My name is Michael and I am an Entrepreneur, Adviser and Innovator in a Small Business and Technical Solutions arena. I'd be happy to offer you additional assistance if you are interested.

Cold emailing is just as bad for you and the recipient. Even if you have the perfect list, the attempt to sell in a cold email is rarely going to be effective. You're better off curating the list to the top prospects, find a mutual connection on LinkedIn or even just cold-invite them on LinkedIn,. Worst case scenario, send a 'permission pass' email where you simply gauge interest and let them know you won't be emailing them again if there's no interest. Keep it very short, non-commercial with just solid information/links to web, and an easy to reply yes/no answer.

The typical consultant answer is 'test it' but there are some good places to start. People generally start checking email when they show up to work (yes that includes personal). Sending around 8:30AM will give you a good shot of being at the top of their inbox then. Another good time is before lunch break. Shoot for something around 12:00PM for this. If you have an email provider that allows you to adapt your send to the local time, use that. But if not, go for EST. Close to 50% of the US population lives in that, with another 30% one hour behind in central.