Grafana SMTP configuration failing with unencrypted connection

Hi Team,

I am using grafana 9.0.4 on the container and trying to configure the SMTP to send the alerts over email. For the same, i have passed the required field and created my own container from grafana 9.0.4 version. Below is the docker file I used to create my own grafana image.

FROM grafana/grafana:9.0.4
    GF_SMTP_HOST=<my company SMTP server> \
    GF_SMTP_FROM_ADDRESS=<my company email id> \
    GF_SERVER_DOMAIN=<my application server hostname> \
    GF_SMTP_FROM_NAME=<my company email ID name> \
    GF_SMTP_USER=<username to authenticate with SMTP server> \
    GF_SMTP_PASSWORD=<Password to authenticate with SMTP server> \

After creating the image I created the container. to test the SMTP, I have gone to alerting and contact points and created a new contact point with my company email ID to test the alert.
So when I send the test alert it’s failing to send the alert and shows me an error message that
Failed to send test alert: Failed to send a notification to email address: unencrypted connection. image as below.

And from container logs i see below logs, t=2022-09-22T15:39:24.775014379Z level=error msg="Missing receiver" t=2022-09-22T15:39:24.775115337Z level=error msg="Missing group labels"
logger=context traceID=00000000000000000000000000000000 userId=1 orgId=1 uname=admin t=2022-09-22T15:39:25.147177545Z level=info msg="Request Completed" method=POST path=/api/alertmanager/grafana/config/api/v1/receivers/test status=207 remote_addr= time_ms=394 duration=394.994208ms size=460 referer="http://localhost:3001/alerting/notifications/receivers/new?alertmanager=grafana" traceID=00000000000000000000000000000000

So anyone please guide me on how to resolve this problem?

Hi @SarvaBhowma,

Please add this line in your SMTP config as it might help:


Also, when you define the parameter for GF_SMTP_HOST are you also defining the port as well for e.g.


Lastly, can you verify this for e.g. test the SMTP with telnet without using Grafana (adjust your firewall to allow it e.g. on port 25)

telnet localhost 25

and see if you get a EHLO response

Thank you for the message @usmanahmad

I have added the GF_SMTP_SKIP_VERIFY=true in my docker file and built the container. However, i am still seeing same unencrypted connection error.

I have given my corporate SMTP server details (using 25 port). So I logged into the container and tested the connection with 25 and it worked fine. I think it’s a problem with how grafana is sending the data to the smtp server when I am using the credentials or my company active directory is strictly expecting a specific type of connection.

Do you think I should check about using an SMTP server with TLS and with 465 or 587 ports.?

Just to add more context,
when i don’t use username and password fields(like below), I am receiving the emails, but only when I am trying to give credentials to authenticate it’s giving this error(I checked credentials are working perfectly fine.)


Hi @SarvaBhowma,

So if the SMTP Server is configured to receive messages from secure ports e.g TLS then in your config for GF_SMTP_HOST try to test it out with e.g. localhost:465 OR localhost:587

Also you can add this additional config parameter in your docker-compose as it might help further i.e.