So I would love to be able to forward an email into DEVONthink.
One use case is from IOS inside Gmail app I have a valuable email I want to get into my 2nd brain DEVONthink
How?
While I don’t do this often from Gmail, I connect to my Gmail account using Apple Mail. When I want to put a mail (or a selection of mails) from any account showing in Apple Mail … just drag and drop into the DEVONthink group. There also is, of course DEVONthink’s mail archiving and importing for some or all of your mail. All discussed in the “DEVONthink Handbook”.