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Document plus addressing and DEFAULT_RELAY_HOST format

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These are a couple of things that work but got me losing lots of hours. Let me add them to README:

1. Fix #1330 explaining that plus addressing works out of the box.
2. Explain that DEFAULT_RELAY_HOST will fail to authenticate with RELAY_USER and RELAY_PASSWORD if you forgot the brackets.

@Tecnativa TT20505
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Jairo Llopis 2019-12-03 13:52:26 +00:00
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@ -28,6 +28,8 @@ Includes:
- persistent data and state (but think about backups!)
- [Integration tests](https://travis-ci.org/tomav/docker-mailserver)
- [Automated builds on docker hub](https://hub.docker.com/r/tvial/docker-mailserver/)
- Plus addressing (a.k.a. [extension delimiters](http://www.postfix.org/postconf.5.html#recipient_delimiter))
works out of the box: email for `you+extension@example.com` go to `you@example.com`
Why I created this image: [Simple mail server with Docker](http://tvi.al/simple-mail-server-with-docker/)
@ -683,7 +685,9 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
#### DEFAULT_RELAY_HOST
- **empty** => don't set default relayhost setting in main.cf
- default host and port to relay all mail through
- default host and port to relay all mail through.
Format: `[example.com]:587` (don't forget the brackets if you need this to
be compatible with `$RELAY_USER` and `$RELAY_PASSWORD`, explained below).
## Multi-domain Relay Hosts