I wonder what you don't like about "groups.io" Its pretty much a puremailing list?
The one thing I would change here is removal of the restriction on attachments.
On Wed, 17 Jun 2020, Dave Wade via cctalk wrote:
They take up a lot of space.
FREE mail lists on groups.io have a size limit. I don't think that it is a very strenuous limit. BUT, larger volume, such as ATTACHMENTS, bumps it into having to pay a subscription fee.
