SMTP connection problem, docker installation

Installation
3

If you use discourse_docker, try setting this in your app.yml:

DISCOURSE_SMTP_AUTHENTICATION: login

If you don’t use docker, try setting this in your discourse.conf:

smtp_authentication = login

By default, Discourse uses plain authentication (which is not what MS Exchange expects):

https://github.com/discourse/discourse/blob/be3a5a56ccc284b352aa65080fc6b955f73cc72a/config/discourse_defaults.conf#L74

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