Mail-Grab

Mail-Grab works with the Mail application to create email messages that are to be sent to multiple recipients. Use Mail-Grab to extract addresses either from the mail application itself or a text file and then process the content, removing duplicates. This set can be further narrowed down by using Mail-Grab's filter features, by either excluding some addresses, or creating a set that is common to another set.
You can also save your content in order to use it at a later time, Print it, so you can study it more comfortably, or even Export it so you can use it with other applications.