I need to be able to manage several mailing lists, easily administrate members, and ideally see archives of all the messages shown.
Mailman: hard to use / set up (I admin'd my own instance and hated it), but if there are good paid services I'd consider this.
Google Groups: lots of chatter about it being abandonware. We use it as part of Gsuite for business but it's not amazing. I wouldn't have this as part of a domain though, so not sure how it would work.
Discourse et al.: feel more like fora which can be used for mailing lists as well, but not sure if it will give me what I need.
I use LibreOffice personally, and I'm thinking about moving the team to it before we seriously grow.
Has anyone tried this in their companies? Was it successful? I'm especially interested in companies of a similar size (or larger) than ours, and those where not everyone is super technical / a software engineer.
My big concerns are support and training, I think there are companies who offer this which would make it a lot easier.
(Edit: to be clear, our CFO will probably continue to use Excel, as will some of the team who build very complicated modelling sheets as that is what they're used to, but I'm thinking for the rest of us who mostly need decent spreadsheets, and good word-processing and presentation tools).