I’ve been testing a few different email clients to use as a drone for multiple mail accounts under OSX Yosemite 10.10.1. My results so far:
**Mac Mail **crashes randomly every few days, automatically downloads attachments and so is sadly no longer a candidate.
**Airmail **has a great interface and tight SpamSieve integration, BUT has problems: can’t shut down gracefully (spinning beachball of death every time) and it randomly marks some mail as spam but leaves it in the Inbox. In the client it shows it moved into the spam folder (but greyed out / no right-click options available), but via webmail or other clients the mail is still in the Inbox. Shame - their support doesn’t seem to acknowledge the various users with the same problem.
**Postbox **doesn’t seem to have these problems - so far has been reliable, however the “Mark > As Junk” command only *flags *emails and leaves them in the Inbox, it doesn’t MOVE them to the designated Spam folder. Is this by design? Or is there a fix for this?