Do you have TheSchwartz set up? The workers don't really care if its set up or not and just run anyway (but won't be able to do anything, they just won't mention it either)

See http://wiki.dwscoalition.org/notes/TheSchwartz_Setup

That page is kinda out of date, the first step needs to be "visit http://yoursite.org/tools/importer" (not use the command line tool)

Also, a status of 'ImportStatus' means the task was aborted, so either you tried to start a second import before your other one completed, or I think that could possibly happen because you don't have TheSchwartz setup.

Also step #2 is that you have to run bin/worker/import-scheduler after each step (it's a one-off thing)

Then run bin/worker/content-importer-verify --verbose, wait till it finishes, ctrl-c it
run bin/worker/import-scheduler again
run bin/worker/content-importer --verbose

and keep running bin/worker/import-scheduler in another window until your job finishes.

You will have to keep the worker-manager running -- and I'm not sure if the default config has everything you'll need (I'll look into that) -- but it won't actually use the GMail account as the SMTP server, it'll send the mail itself. There might be a way to use a different server.