How to set SMTP config to use localhost?

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1

I have postfix configured to work on the local docker host such that a test via swaks --to destination@domain.tld --from admin@hostdomain.tld --server localhost -tls delivers as expected. It uses port 25 and sends out the email with no problem at all.

So I’m lead to the question: how do I set up app.yml SMTP config settings appropriately to utilize localhost for mail delivery?

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2

Set SMTP address to 127.0.0.1

3

So to be clear, are you saying only the IP should be configured and the other fields commented out? Eg:

  DISCOURSE_SMTP_ADDRESS: 127.0.0.1
  #DISCOURSE_SMTP_PORT: 25
  #DISCOURSE_SMTP_USER_NAME: 
  #DISCOURSE_SMTP_PASSWORD:
  #DISCOURSE_SMTP_ENABLE_START_TLS: true           # (optional, default true)
4

If it’s on the same docker host but within a different docker container you need to specify the host IP.

127.0.0.1 won’t work as that’s the loopback address. Each container sees 127.0.0.1 as itself.

5

This is not in a different docker container, but simply on the docker host itself.

6

It’s still going to need the host IP then.

7

So in such a case you need to use the public IP or is thre a special IP scheme that Docker uses? For example, within the host I see docker0 with 172.17.0.1 and within the container (./launcher enter app; apt-get install ifconfig) eth0 is 172.17.0.2. I suspect I should use the host’s 172.17.0.1 w/in the discourse container, but I wouldn’t want it to change on me somehow and at some point.

8

Just to document here, the following was sufficient (all other SMTP lines commented out) to deliver to the docker host’s smtp server if no auth is necessary:

  DISCOURSE_SMTP_ADDRESS: 172.17.0.1
  DISCOURSE_SMTP_PORT: 25
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9

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