SMTP Error in Grafana Alerting: Failed Notifications and Authentication Issues (How to Authenticate SMTP without Password)

Grafana Alerting
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1

I attempted to send alerts using Grafana but encountered an SMTP error. Here is the SMTP configuration from the Grafana Helm Chart (version 6.54.0) and SMTP host (Microsoft ESMTP MAIL Service)

grafana.ini:
smtp:
enabled: true
host: example.local:25
from_address: "noreply-staging-portal@example.com"
skip_verify: true

When deploying with this configuration, I receive the following error: “Failed to send a test alert: failed to send notifications to email addresses: abc@example.com: gomail: could not send email 1: 550 5.7.1 Unable to relay.”

If I provide a username and leave the password empty, I receive the following error: “Failed to send a test alert: failed to send notifications to email addresses: abc@example.com: 535 5.7.3 Authentication unsuccessful.”