How can I keep my group's membership list current?

As a Moderator, it's difficult to manage who is in my group's list serve. People change their email, use an obscure email name or don't have the same email as they have in my member database. So people end up staying on the list serve and not bothering to renew. Right now, I am having to manually match my membership list with the Yahoo member list to figure out who's who. It would help if I could print a list in alphabetical order other than going through each page for each letter in the alphabet or printing the download of the entire list which is not in alpha order. Any other ideas?