Email alert error in grafana, when i am trigger the test email notification

The below error i am getting when i am trying to trigger the mail from grafana

grafana_1 | t=2018-09-21T09:54:08+0000 lvl=info msg=“Sending alert notification to” addresses=[]
grafana_1 | t=2018-09-21T09:54:08+0000 lvl=eror msg=“Failed to send alert notification email” error=“dial tcp getsockopt: connection refused”

You smtp settings (in grafana ini) seems to be incorrect or the smtp server cannot be reached

yes smtp configuration problem, we fixed it
Thank you

excuse me, how to fixed smtp configuration?
I can’t receive test email .