[MM3-users] Reject with notification not working

I'm creating a newsletter style mailing list where only one address is allowed to send e-mails, members just receive them, but they shouldn't be able to post to the list. Still I want to send a friendly notification if members accidentally try to post to the list, so I set "Reject (with notification)" as "Default action to take when a member posts to the list", but it doesn't work: my test address didn't receive any notification when I tried to send a message to the list. I tried to define the "list:user:notice:rejected" template for the list, but to no avail.