Support importing mbox files
It seems that there is currently no way to import mailboxes downloaded as mbox files.
As I've switched email accounts several times, I have mbox exports as archives, which are sometimes handy. It'd be great if Geary supported opening these files.
How would you like it to work?
An "Import..." item in the main menu.
Relevant links, screenshots, etc
Thunderbird supports MBox files, for example.