This is the best mail archive app for mac, other closest alternative is eagle filer, i like eagle filer interface better, but unfortunately the email preview is messed up. But mail archiver x can preview my email nicely, without messing it up. Plus i amaze how the developers react to my email, they solve the problem right away, it's not a mistake to buy this.
My wish for this app:
1. Better icon
2. Selectable tab in mail list
Other than that, this is a great app.