docs: clearer README, more user-friendly

README.md

@@ -4,54 +4,122 @@
 [![MailServer](https://img.shields.io/badge/server-postfix-8B1E3F)](#)
 [![License](https://img.shields.io/badge/License-MIT-green)](./LICENSE)
 
-Automated Bash installer for deploying **Postfix** non-interactively on Ubuntu 24.04 Server — ideal when you just need a working mail server and don’t want a screen full of configuration prompts. The script comes with an optional Mailutils installation flag. 
+Automated installer for **Postfix** on Ubuntu 24.04.  
+Zero-click configuration — no interactive screens, no “mail name?” prompts.
 
-This is a **production-focused installer**, not a demo.
+This is a **production-ready mail server installer**, not a lab exercise.
 
 ---
 
-### Preparing
-
-Update your package index before running the installer:
-
-```
-sudo apt update -y
-```
-
----
-
-### Download the Script
-
-Clone the repository from your Git server:
+## 1. Install
 
 ```
 git clone https://git.x-files.dk/mail/postfix-ubuntu.git
-```
-
-```
 cd postfix-ubuntu
-```
-
-### Usage
-
-Run the script using the `-m` flag to control whether Mailutils will be installed as well (`yes` or `no`).
-
-```
 sudo ./postfixinstall -m <yes|no>
 ```
 
-### Example
+### Flags
 
-Install Postfix **with** Mailutils:
+| Option | Meaning |
+|---|---|
+| `-m yes` | Install Postfix + Mailutils |
+| `-m no`  | Install only Postfix |
+
+Examples:
 
 ```
-sudo ./postfixinstall -m yes
+sudo ./postfixinstall -m yes    # Postfix + Mailutils
+sudo ./postfixinstall -m no     # Pure Postfix only
 ```
 
-Install Postfix **only**:
+---
+
+## 2. Service Status
 
 ```
-sudo ./postfixinstall -m no
+systemctl status postfix
+systemctl enable postfix
+```
+
+Send test mail (if Mailutils installed):
+
+```
+echo "Postfix is alive" | mail -s "Test" root@localhost
+```
+
+---
+
+## 3. Default Configuration
+
+Main config file:
+
+```
+/etc/postfix/main.cf
+```
+
+Common values:
+
+```
+myhostname = mail.example.com
+myorigin   = /etc/mailname
+mydestination = localhost, $myhostname
+relayhost =
+inet_interfaces = all
+```
+
+Reload config:
+
+```
+sudo systemctl reload postfix
+```
+
+---
+
+## 4. TLS + Certbot Integration (optional)
+
+Recommended additions:
+
+```
+smtp_tls_security_level = may
+smtp_tls_loglevel = 1
+smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
+```
+
+Apply:
+
+```
+sudo systemctl reload postfix
+```
+
+---
+
+## 5. Useful Commands
+
+List queue:
+
+```
+mailq
+```
+
+Flush queue:
+
+```
+postfix flush
+```
+
+Logs:
+
+```
+journalctl -u postfix -f
+```
+
+Control service:
+
+```
+systemctl stop postfix
+systemctl start postfix
+systemctl reload postfix
 ```
 
 ---
@@ -63,5 +131,6 @@ More guides and documentation can be found on [wiki.x-files.dk](https://wiki.x-f
 ---
 
 ### License
-
 Licensed under the [MIT License](./LICENSE).
+
+---