Need help finding or piecing together a software that does a thing.

Dadboss informed me of something our company used to use way back, Yahoo Groups, as an email newsgroup.

Apparently, our members were really into it because they didn’t have to go anywhere or log in to anything.

They received an email and simply hit reply and it added their response.

He wants something like that crossed with Substack.

Sounds like maybe something #Indieweb protocol can do?

I don’t know; I’m not a developer, but I’m pretty good at piecing things together out of existing technology.

And maybe it already exists!

If someone could point me in the right direction I would be very grateful.