yes, a community can be cultivated. it's okay okay if it's just a moment in time and is meaningful for some and then people move on, it's also okay/wonderful if it takes off and becomes a haven of sanity and togetherness. i'm sorry if i came off as too jaded, i don't mean to dissuade you from trying, and i'm glad you're thinking about it!
feel free to ping me if you want more technical tips, or if you want to use my mailman instance instead of trying to shave that particular hairy yak.
Maybe if you have an easily-accessible list of best practices to run mailman, I'd love to know. I won't lie to you, hearing you talk about DMARC and SPF makes my hair raise already, I hate dealing with SMTP, and I hoped it would be possible to set Mailman up leveraging third-party platforms (i.e. Postmark, Mailgun, etc.) so I wouldn't have to deal with that nonsense.
feel free to ping me if you want more technical tips, or if you want to use my mailman instance instead of trying to shave that particular hairy yak.