MailRecent adds "Copy to Recent," "Move to Recent," and "Go to Recent" menu items to Apple's Mail application.
These menu items contain dynamically-updated lists of recently used mailboxes. The number of mailboxes kept in the list is determined by the "Recent Items" setting in the General panel of the OS X System Preferences. Dan Frakes (MacWorld) wrote about my MailFollowUp and MailRecent plugins in his MacGems Weblog in January of 2007 and rated them in 2008. Joe Kissell listed MailFollowUp as one of his "nine must-have plug-ins for Apple Mail" in 2014.