Can you please share how you fix the SMTP so that it can be helpful for other community users who may run into same issue? 
I have given from address
So that it worked
Can you please tell why the issue is coming
Gald to hear it worked.
I would suggest to create a new post under Alerting category because it seems a fitting question for that category (while this one is actually under configuration category).
You could reference this post there too but its optional.
Can I create on git hub??
You should first create a post in the forum so that others can view it and try to help you out.
I have one doubt
How can we get the owner of namespace in grafana in the dashboard
Can you please tell