Adding external SMTP Service

• I have seen https://docs.wire.com/ and https://github.com/wireapp/wire-server-deploy - the documentation there does not answer my question.

My question:

Adding a service like this:

Only the commented out section is relevant

resulted in

but when using NodeMailer to test the Mail-Service it worked fine:

Context:

Please provide sufficent context about your problem:

It is a bare-metal demo-install

How did you install wire-server?

On kubernetes? With docker-compose? by manually compiling and running?

Kubernetes through the ansible playbook.

How many servers are involved?

1 - demo install

What is installed on which servers?

everything is installed on the same server - demo

E.g Server A has component X and server B has component Y

Provide details about networking

We don't need to know any specific IP address, but it helps if you provide information whether an IP is ipv4 or ipv6, whether is is publicly reachable from the global internet or not, and if you installed any component of wire-server, which network interfaces are processes listening on?

I did not change anything about the networking

How did you configure wire-server?

Note: only the configuration from helm charts in wire-server-deploy is what we support, like these defaults applied here in the case of brig. If you have used other configuration files, please post them (or the relevant parts of them).
Did you use the helm charts from wire-server-deploy?
Did you use and adapt configuration files from wire-server? If so, which ones?
Are there any overrides?

Just the default demo install

Start with the wire-server-deploy Helm configuration referenced in the issue, especially brig/values.yaml and brig/templates/configmap.yaml, and compare it with the external SMTP setup shown in the screenshots. Reproduce the configuration in the Kubernetes demo installation and verify the resulting mail-service behavior. Done means the supported SMTP configuration and cause of the failure are established.