ubuntu, postfix setup

ubuntu-postfix-setup.sh

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+#!/bin/bash
+
+# source:
+# https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-22-04
+# 
+
+set your_domain="abc.com"
+
+sudo apt update
+sudo apt install mailutils
+
+# sudo vim /etc/postfix/main.cf
+# 
+# masquerade_domains = {your_main_domain}
+# inet_interfaces = loopback-only
+
+# restart service
+sudo systemctl restart postfix
+
+# to test smtp is working:
+# echo "This is the body of the email" | mail -s "This is the subject line" your_email_address
+
+# to add email forwarding:
+# sudo vim /etc/aliases
+# 
+# postmaster:    root
+# root:          your_email_address
+# 
+# for the change to take effect run:
+# sudo newaliases
+# 
+# to test email forwarding:
+# echo "This is the body of the email" | mail -s "This is the subject line" root
+
+
+
+# Enable SMTP Encryption
+#
+# install certbot:
+sudo apt install certbot
+
+# make sure server port 80 is open underfirewall
+# if you are using on server firewall "ufw", do:
+# sudo ufw allow 80
+
+# get cert
+sudo certbot certonly --standalone --rsa-key-size 4096 --agree-tos --preferred-challenges http -d $your_domain
+
+# sudo vim /etc/postfix/main.cf
+# 
+# smtpd_tls_cert_file=/etc/letsencrypt/live/your_domain/fullchain.pem
+# smtpd_tls_key_file=/etc/letsencrypt/live/your_domain/privkey.pem
+
+# restart service
+# sudo systemctl restart postfix
+
+# test 
+# echo "This is the body of an encrypted email" | mail -s "This is the subject line" root