A script that does not time out - when sending out 25,000+ emails, the email script will sometimes time out.
1 click unsubscribe - members need a way to click 1 link and unsubscribe from admin emails.
A way to manage bounced email addresses.
A way for the forum to check members email addresses to see if their still active. If the email is not active, give the admin options on what to do. I would like it if all members with bounced emails get moved into a "waiting for email confirmation" group. This would stop people from using those 10 minute email sites.
Ability to send HTML emails - or plain text, but we should have the option.