Mail Satellite 1.9

Create, send, and track great-looking email newsletter.

Extract e-mail addresses from various file types and save them for later use.

Add-in to iCal that gives the user options for how replies to meeting invites that are sent with Mail are dealt with.

Use Mail-Grab to extract email addresses from your Mail app or text files.

Free

The Unread puts a Status Item in menu bar whose customizable title can display.