I have installed success and using openproject in office, but I cant receive the email notification when work create or assign.
I check email notification in the system setting and it’s work to “send a test mail”, so I think the smtp setting in configuration.yml should be correct.

system setting:
Default notification option : For any event on all my projects

the crontab is:
/1 * * * cd /home/project-vm/openproject-ce; /home/project-vm/.rbenv/versions/2.3.0/bin/rake jobs:workoff

I also manually execute the command and response :
/home/project-vm/openproject-ce/vendor/bundle/ruby/2.3.0/gems/fog-1.23.0/lib/fog/rackspace/mock_data.rb:42: warning: key “name” is duplicated and overwritten on line 80
/home/project-vm/openproject-ce/lib/open_project/configuration.rb:36: warning: already initialized constant OpenProject::Configuration::ENV_PREFIX
/home/project-vm/openproject-ce/lib/open_project/configuration.rb:36: warning: previous definition of ENV_PREFIX was here
[Worker(host:ubuntu pid:130793)] Starting job worker
[Worker(host:ubuntu pid:130793)] No more jobs available. Exiting

what’s going on? I need to setup the delay_job or not?
Thanks for help.

Core version : OpenProject 5.0.20 (Mysql2)