Let's see. The old way you click on the mail icon for each person. So that's 330 clicks and 330 popup windows and 330 clicks again to send the address to your mailer. The old way doesn't seem very efficient to me. For such mass DO mailings, wouldn't it be more efficient to send one message to the thread asking everyone to email you? Then your local mailer could deal with it. You could even write a script to do it automatically if you your talents lie in that area. Then only the people who want to get mail from you will respond.
Believe me I want and need to get instant email working again. So far my proposal seems to be the best way to have that happen and prevent spammers. But I'm all ears!