Error while configuring email alert

I am not able to configure email alerts from couchbase console. I am getting an error pop up message stating :
“An error occurred during sending test email.”
Couchbase version is 5.0.1.
Got this below error details from log:
“Could not send email: {error,retries_exceeded, {network_failure,“localhost”,{error,econnrefused}}}. Make sure that your email settings are correct.”
Please suggest what I need to do to resolve the issue.

Can anyone update on the same as I am stuck at the same point with the same error message.

I am getting the below error while sending test mail.

image

Please suggest what needs to be done.

Does all the nodes in your cluster have access to the email server? (firewall, etc.)

I am trying from local couchbase console host (127.0.0.1). What do you mean by access to email server? I have authenticated SMTP server,host,port,username and password. Shall i need any access from particular node to configure email alert?