I can't remember the specific details, but what is the maximum number of subscribers that mailman can handle? What is the practical number?

If it can hold thousands, is there any easy way to search the member list for specific addresses?

The reason I ask this is I have a 19,000 member list that I'm thinking of migrating, and some of the addresses in it are not the current addresses users are using... So when they ask to be removed, and can't find their exact address, I need to do the greping to find them.

Also, do all users have to have passwords? I can disable that can't I?

If these are dumb questions that have been answered somewhere, please point me in that direction.

Thanks.