[Evolution] Command Line Export of Messages to mbox Format

[Esben Stien <b0ef esben-stien name>]

I need to export a whole slew of directories in Evolution to mbox
files. All I've found is some graphical way to do one directory at a
time. 

I'm looking for a command to export Evolution directories to mbox files. 

The Evolution profile contains very many directories.

Any pointers as to how I can achieve this?

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