I'm about to email 7,000+ startup founders, solopreneuers, and indie hackers about my new product. Any tips?

I would suggest doing a staged email blast. So say 100-500 users first then a few days later 1000 and then a few days later the rest.

A while back a client managed to get their own company name and the promotion URL wrong. Auto correct did not like how their company name was spelled so it went ahead and "corrected it" for them and no one noticed. But their follow up email to fix the issue was actually pretty funny and personal. The follow up mail got a lot more traction that the original. So maybe the moral is you need to mess up and apologize after!

I would advise speaking to different people differently. For those you've spoken to on the phone with, it might be worth adding some more personal language since you may know more about them?

I also recommend breaking your initial email down into more than 1 segment and send in a staggard timeframe. After evaluating the performance of your first send you might notice changes you want to make to the subject line or perhaps even to the offer.

We did this with our launch of LearnStash.com a couple of weeks ago and proved to be really helpful.

• I would segment your subscribers and then send personalized emails to each of the segments
• Would start to announce your new product first to a small segment (maybe 100 founders) and check their response. If the response is good, send to new segments; if the response is low, I would try to find out why (sales copy? wrong target customer?...)
• I would give them the feeling of being special, e.g. a LTD or special discount on your new product only for your email subscriber