Me again, Sorry
Can you see anything wrong?
The config looks fine to me. Anything in the logs? Are you able to send mail at all? (Try the vikunja testmail command)
Sorry, where do I run the vikunja testmail command?
and where do I find log? what file
You can get the logs with docker-compose logs.
Running the testmail command in docker can be done something like docker-compose exec /app/vikunja/vikunja testmail <your email address>.
Any errors? That seems to indicate your email setup does not work.