Introducing MsgFiler
This 60-second goes over the primary features and benefits of MsgFiler, demonstrating how you can save time over drag and drop filing of your messages in Apple Mail.
Meghan Wilker, Geek Girls GuideDude, it’s brilliant. I started using it today and I already feel like it’s saving my life (and about a million minutes a day of drag-and-dropping).
Filing Speed Test
This 44-second video compares filing speeds between MsgFiler and dragging and dropping in Apple Mail. MsgFiler finishes filing eighteen messages in twenty seconds, whereas the drag and drop method takes 32 seconds. That’s a 38% increase in filing speed on only a small sampling of messages.
Ed Zalta, Stanford UniversityOne of the most useful pieces of software I own; I’m sure it increases my efficiency in dealing with mail by several factors, if not an order of magnitude.

I believe the speed improvement is much higher than stated on this website, especially when using a lot of sub-mailboxes! Great tool!