MailHub for Sierra (was MailHub for El Capitan) is a time-saving email management plugin that can file, delete, or enact actions on emails without leaving your inbox. Email from a contact or thread can be batch-filed to a mailbox (or deleted) with a series of simple mouse clicks or key strokes, radically reducing time spent on mail administration. MailHub even allows you to specify filing destinations for an outgoing message during composition. Create new mailboxes as you go and set action reminders so you won't forget a vital task at a later date.
Note: This update requires a new license. If you purchased MailHub after 20th September 2015, you are eligible for a free upgrade. For purchases before 20th September 2015, you can update at a discount. In both cases, please use this page to upgrade your license: http://dervishsoftware.com/mailhub/upgrade/