1511: Setup, compose: add note about reverse DNS r=mergify[bot] a=liquidat

## What type of PR?

documentation

## What does this PR do?

If the [mailu setup utility](https://setup.mailu.io/master/) is used with the Compose flavor, in step 4 a list of public host names needs to be provided:
![Screenshot from 2020-05-17 01-54-06](https://user-images.githubusercontent.com/1998084/82132563-5227d780-97e1-11ea-85ed-fa5d5108e24e.png)
The [first entry in this list is configured as hostname by postfix](ddac2672fc/core/postfix/conf/main.cf (L10)). That is crucial: if the reverse DNS entry for that host is not the same as this first entry in this list, it will be a mismatch between rDNS and HELO, which will lead to bad scoring in many spam filters.

This commit clarifies that point.
It also fixes a missing parenthesis.

### Related issue(s)

- (none)

## Prerequistes

- (none applicable)

Co-authored-by: liquidat <liquidat@bayz.de>
master
bors[bot] 4 years ago committed by GitHub
commit 88ffb9fcf1
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@ -52,7 +52,9 @@ avoid generic all-interfaces addresses like <code>0.0.0.0</code> or <code>::</co
hostnames. Every e-mail domain that points to this server must have one of the hostnames. Every e-mail domain that points to this server must have one of the
hostnames in its <code>MX</code> record. Hostnames must be comma-separated. If you're having hostnames in its <code>MX</code> record. Hostnames must be comma-separated. If you're having
trouble accessing your admin interface, make sure it is the first entry here (and possibly the trouble accessing your admin interface, make sure it is the first entry here (and possibly the
same as your <code>DOMAIN</code> entry from earlier.</p> same as your <code>DOMAIN</code> entry from earlier). Also make sure that the first entry in
this list resolves to the IP address of your server, and that the reverse DNS entry for
the IP address of your server resolves to this first entry in this list.</p>
<div class="form-group"> <div class="form-group">
<label>Public hostnames</label> <label>Public hostnames</label>

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