Is there a way to make DT3 auto import from a particular folder of Apple mail?
And then a step further, make mail archive the email after import?
No. You can use Apple Mail Rules (and there are some included in the default installation of DEVONthink), but you’ll have to set up the Rule in Mail’s Preferences > Mail. Also note we have no control over the behavior of Mail Rules.
PS: Help > Documentation > Automation > Apple Mail Rules. Please make sure you’re consulting the documentation as well. It is part of the beta testing process.
How do I get a pdf of the documentation?
It’s not available at this time.