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21
LICENSE
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21
LICENSE
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MIT License
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Copyright (c) 2025 Allan Christensen
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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164
README.md
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README.md
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# Postfix for Ubuntu 24.04 Server
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[](#)
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[](#)
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[](#)
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[](./LICENSE)
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Install Postfix on Ubuntu 24.04 server.
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This is not a demo and not an experiment.
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No installer prompts, no guesswork — reliable and repeatable mail server deployment.
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## Why this installer exists
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Postfix itself is simple. The interactive installer is not. This avoids incorrect menu selections.
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## What this installer does
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✔ Fully non-interactive setup
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✔ Optional mailutils integration
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✔ Runs as a proper MTA
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✔ Suitable for relay + local delivery
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✔ Consistent, repeatable configuration
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## What this installer does *NOT* do
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It won’t stop you from running the script without reading the documentation like there’s no tomorrow.
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Skip the README, and whatever happens next is your headache, not a bug report.
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---
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## 1. Prepare the system
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```
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sudo apt update -y
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```
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## 2. Download the installer
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```
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git clone https://git.x-files.dk/mail/postfix-ubuntu.git
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```
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```
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cd postfix-ubuntu
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```
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## 3. Run the installer
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```
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sudo ./postfixinstall -m <yes|no>
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```
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### Flags
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| Option | Meaning |
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|---|---|
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| `-m yes` | Install Postfix + Mailutils |
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| `-m no` | Install only Postfix |
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Examples:
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```
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sudo ./postfixinstall -m yes # Postfix + Mailutils
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sudo ./postfixinstall -m no # Pure Postfix only
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```
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---
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## 2. Service Status
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```
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systemctl status postfix
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systemctl enable postfix
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```
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Send test mail (if Mailutils installed):
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```
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echo "Postfix is alive" | mail -s "Test" root@localhost
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```
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---
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## 3. Default Configuration
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Main config file:
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```
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/etc/postfix/main.cf
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```
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Common values:
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```
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myhostname = mail.example.com
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myorigin = /etc/mailname
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mydestination = localhost, $myhostname
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relayhost =
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inet_interfaces = all
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```
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Reload config:
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```
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sudo systemctl reload postfix
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```
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---
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## 4. TLS + Certbot Integration (optional)
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Recommended additions:
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```
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smtp_tls_security_level = may
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smtp_tls_loglevel = 1
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smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
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```
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Apply:
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```
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sudo systemctl reload postfix
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```
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---
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## 5. Useful Commands
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List queue:
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```
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mailq
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```
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Flush queue:
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```
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postfix flush
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```
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Logs:
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```
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journalctl -u postfix -f
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```
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Control service:
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```
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systemctl stop postfix
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systemctl start postfix
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systemctl reload postfix
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```
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---
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### More Information
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More guides and documentation can be found on [wiki.x-files.dk](https://wiki.x-files.dk)
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---
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### License
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Licensed under the [MIT License](./LICENSE).
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---
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4
last-tested
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------------------------------------
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Last tested: 19-12-2025 (DD-MM-YYYY)
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Environment: Ubuntu Server 24.04 LTS
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------------------------------------
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108
postfixinstall
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108
postfixinstall
Executable file
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#!/usr/bin/env bash
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# Author : Allan Christensen
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# First Created : 17-10-2020 (DD-MM-YYYY)
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# Description : Installs Postfix and optionally Mailutils on Ubuntu 24.04
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# License : MIT License
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#
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# Are we root
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#
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if [[ $(id -u) -ne 0 ]]; then echo "" && echo "Must be root or use sudo" && echo "" ; exit ; fi
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#
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# Define variables and functions
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#
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install_utils="no"
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#
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# Function to check if a service is already running
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#
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serviceyes () { printf "\n%s" $service ; printf " is already running cannot continue...\n\n"; }
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servicealive () { status=$(systemctl is-active $service); if [[ "$status" == "active" ]]; then serviceyes ; exit 1; fi; }
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#
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# Usage function
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#
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usage() {
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printf "\nUsage:\n"
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printf " sudo ./postfixinstall [-m yes|no]\n\n"
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printf "Options:\n"
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printf " -m <yes|no> Install Mailutils (defaults to no)\n"
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printf " -h Show this help message\n\n"
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printf "Examples:\n"
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printf " sudo ./postfixinstall # install Postfix only\n"
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printf " sudo ./postfixinstall -m yes # install Postfix + Mailutils\n\n"
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exit 1
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}
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#
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# If Postfix is already running then die
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#
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service="postfix" ; servicealive
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#
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# Let's go
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#
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clear
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#
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# Parse options
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#
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while getopts ":m:h" opt; do
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case "${opt}" in
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m)
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arg="${OPTARG}"
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if [[ -z "$arg" ]]; then
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printf "\nOption -m requires an argument (yes/no).\n"
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usage
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fi
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case "${arg,,}" in
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y|yes) install_utils="yes" ;;
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n|no) install_utils="no" ;;
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*) usage ;;
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esac
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;;
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h)
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usage
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;;
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:)
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printf "\nOption -%s requires an argument (yes/no).\n" "$OPTARG"
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usage
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;;
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\?)
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printf "\nInvalid option: -%s\n" "$OPTARG"
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usage
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;;
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esac
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done
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#
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# Require -m flag
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#
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if [[ "$OPTIND" -eq 1 ]]; then
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printf "\nMissing required option: -m <yes|no>\n"
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usage
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fi
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#
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# Install Postfix (non-interactive) and backup main.cf
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#
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printf "\nInstalling Postfix...\n"
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DEBIAN_FRONTEND=noninteractive apt-get install -y postfix >/dev/null 2>&1
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[[ -f /etc/postfix/main.cf ]] && cp -p /etc/postfix/main.cf /etc/postfix/main.cf.bak.$(date +%d-%m-%Y-%H%M%S)
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systemctl enable postfix >/dev/null 2>&1 && systemctl restart postfix
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#
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# Optionally install Mailutils
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#
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if [[ "$install_utils" == "yes" ]]; then apt-get install -y mailutils >/dev/null 2>&1 ; fi
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#
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# All done
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#
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printf "\nAll Done...\n"
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#
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# End of script
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#
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