Good to know you can disable delivery completely once signed up, I haven't used mailman in ages! I will sign up in this case. The signup page only lets you switch to digest, which can mislead new users.

BTW mailing lists can work great for guest visitors who don't want to subscribe. They can also work great for teams who don't want guests.

The problem is openjdk mailman allows guest posting and lies about guests posts awaiting moderation. Had they simply disabled guest posting and said up-front that you must subscribe and send rejection notice to guests I would be perfectly fine with that.

Mailman sucks worse than even Google Groups and in this case it's also poorly configured.

PS. To add to frustration, LastPass (I know it's shit but don't have time to migrate) somehow can't deal with Mailman signups - it will generate but won't save passwords.