Update docs

docs/firststeps-local_mta.md

@@ -4,4 +4,14 @@ The easiest option would be to disable the listener on port 25/tcp.
 ```
 #smtp      inet  n       -       -       -       -       smtpd
 ```
+
+Furthermore, to relay your local mail over the dockerized mailcow, you may want to add `172.22.1.1` as relayhost:
+
+```
+postconf -e 'relayhost = 172.22.1.1'
+```
+
+"172.22.1.1" is the mailcow created network gateway in Docker.
+Relaying over this interface is necessary (instead of - for example - relaying directly over ${MAILCOW_HOSTNAME}) to relay over a known internal network.
+
 Restart Postfix after applying your changes.

docs/install-update.md

@@ -1,4 +1,19 @@
-There is no update routine. You need to refresh your pulled repository clone and apply your local changes (if any). Actually there are many ways to merge local changes.
+## Automatic update
+
+An update script in your mailcow-dockerized directory will take care of updates.
+
+But use it with caution! If you think you made a lot of changes to the mailcow code, you should use the manual update guide below.
+
+Run the update script:
+```
+./update.sh
+```
+
+If it needs to, it will ask you how you wish to proceed.
+Merge errors will be reported.
+Some minor conflicts will be auto-corrected (in favour of the mailcow: dockerized repository code).
+
+## Manual update
 
 ### Step 1
 

docs/install.md

@@ -1,6 +1,6 @@
 You need Docker and Docker Compose.
 
-1\. Learn how to install [Docker](https://docs.docker.com/engine/installation/linux/) and [Docker Compose](https://docs.docker.com/compose/install/).
+**1\.** Learn how to install [Docker](https://docs.docker.com/engine/installation/linux/) and [Docker Compose](https://docs.docker.com/compose/install/).
 
 Quick installation for most operation systems:
 
@@ -17,17 +17,17 @@ chmod +x /usr/local/bin/docker-compose
 
 Please use the latest Docker engine available and do not use the engine that ships with your distros repository.
 
-2\. Clone the master branch of the repository
+**2\.** Clone the master branch of the repository
 ```
 git clone https://github.com/mailcow/mailcow-dockerized && cd mailcow-dockerized
 ```
 
-3\. Generate a configuration file. Use a FQDN (`host.domain.tld`) as hostname when asked.
+**3\.** Generate a configuration file. Use a FQDN (`host.domain.tld`) as hostname when asked.
 ```
 ./generate_config.sh
 ```
 
-4\. Change configuration if you want or need to.
+**4\.** Change configuration if you want or need to.
 ```
 nano mailcow.conf
 ```
@@ -35,7 +35,7 @@ If you plan to use a reverse proxy, you can, for example, bind HTTPS to 127.0.0.
 
 You may need to stop an existing pre-installed MTA which blocks port 25/tcp. See [this chapter](https://mailcow.github.io/mailcow-dockerized-docs/firststeps-local_mta/) to learn how to reconfigure Postfix to run besides mailcow after a successful installation.
 
-5\. Pull the images and run the composer file. The parameter `-d` will start mailcow: dockerized detached:
+**5\.** Pull the images and run the composer file. The parameter `-d` will start mailcow: dockerized detached:
 ```
 docker-compose pull
 docker-compose up -d

docs/prerequesite-system.md

@@ -34,7 +34,7 @@ If this command returns any results please remove or stop the application runnin
 If you have a firewall already up and running please make sure that these ports are open for incoming connections:
 
 | Service             | Protocol | Port   | Container       | Variable                         |
-| --------------------|:--------:|:-------|:----------------|--------------------------------|
+| --------------------|:--------:|:-------|:----------------|----------------------------------|
 | Postfix SMTP        | TCP      | 25     | postfix-mailcow | `${SMTP_PORT}`                   |
 | Postfix SMTPS       | TCP      | 465    | postfix-mailcow | `${SMTPS_PORT}`                  |
 | Postfix Submission  | TCP      | 587    | postfix-mailcow | `${SUBMISSION_PORT}`             |
@@ -45,6 +45,11 @@ If you have a firewall already up and running please make sure that these ports
 | Dovecot ManageSieve | TCP      | 4190   | dovecot-mailcow | `${SIEVE_PORT}`                  |
 | HTTP(S)             | TCP      | 80/443 | nginx-mailcow   | `${HTTP_PORT}` / `${HTTPS_PORT}` |
 
+To bind a service to an IP address, you can prepend the IP like this: `SMTP_PORT=1.2.3.4:25`
+
+**Important**: You cannot use IP:PORT bindings in HTTP_PORT and HTTPS_PORT. Please use `HTTP_PORT=1234` and `HTTP_BIND=1.2.3.4` instead.
+
+
 ## Date and Time
 
 To ensure that you have the correct date and time setup on your system, please check the output of `timedatectl status`: