I get this all the time and it's not cool. It might even be a cool project, but if I receive a generic email that even has unparsed
*|FNAME|* mailchimp variables it's just gonna go in my spam (+block) list.
If you want to approach Indiehackers, do so on a personal level and make sure the ones you are contacting are going to be interested in your product. Indiehackers can work in a lot of different domains, so please do your research before wasting people's time and risking building a bad reputation for your email IP address.
I still want to keep my email up on my profile here on this site because sometimes I'm contacted by genuine people that I end up having a nice and useful conversation with, so please stop using these emails in your soulless marketing wannabe campaigns.
This sounds more like a rant, but hopefully, it can be educational to people that did or are thinking about sending mass emails to indiehackers without their consent.