I'm considering setting up a mailman discussion list on dreamhost. I've read folks' concerns about passwords and interface, but those issues seem managable. I'm more concerned about size and bandwidth.
I expect this list to have about 4000 members, and a list-wide 50-message daily limit. That's about 200K emails (plain-text-only) per day. At 40K per email, that's 8 Mb / day of outbound traffic.
These numbers seem pretty middle-of-the-road, but I'd like to make a sanity check, whether other dreamhost clients on shared hosting plans run lists of this size.