Update 2025-04-13_16:14:16

postfix_setup.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+# Script Version: 0.9
+# Description: Check if Postfix is installed before proceeding with installation
+
+# Validate hostname before proceeding
+if [ "$(hostname)" == "$(hostname --fqdn)" ]; then
+    echo "Error: Hostname and fully qualified domain name must differ."
+    exit 1
+fi
+
+# Variables
+# ========
+POSTFIX_MAIN_CF=/etc/postfix/main.cf
+SASL_PASSWD_FILE=/etc/postfix/sasl_passwd
+SMTP_SERVER="mail.bubuit.net"
+SMTP_PORT="587"
+SMTP_USER="srvlogz"
+SMTP_PASS="Id(Z]GtSty2S"
+RECIPIENT="srvlogz@bubuit.net"
+TEST_RECIPIENT="root"
+MAILNAME=$(hostname --fqdn)
+ALIASES_FILE="/etc/aliases"
+
+# Check if Postfix is already installed
+if dpkg -l | grep -q "^ii  postfix "; then
+    echo "Postfix is already installed. Skipping installation."
+else
+    # Preconfigure Postfix installation
+    debconf-set-selections <<< "postfix postfix/mailname string $MAILNAME"
+    debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Local only'"
+
+    # Install required packages non-interactively
+    apt update
+    apt install -y postfix libsasl2-modules mailutils
+fi
+
+# Configure Postfix for SMTP relay (only necessary changes)
+postconf -e "relayhost = $SMTP_SERVER:$SMTP_PORT"
+postconf -e "smtp_tls_security_level = may"
+postconf -e "smtp_sasl_auth_enable = yes"
+postconf -e "smtp_sasl_password_maps = hash:$SASL_PASSWD_FILE"
+postconf -e "smtp_sasl_security_options = noanonymous"
+
+# Store SMTP credentials
+printf "$SMTP_SERVER:$SMTP_PORT $SMTP_USER:$SMTP_PASS\n" > $SASL_PASSWD_FILE
+chmod 600 $SASL_PASSWD_FILE
+postmap $SASL_PASSWD_FILE
+
+# Update /etc/aliases
+if [ -n "$RECIPIENT" ] && ! grep -q "^root: " $ALIASES_FILE; then
+    echo "root: $RECIPIENT" >> $ALIASES_FILE
+    newaliases
+else
+    echo "Alias for root already exists, skipping update."
+fi
+newaliases
+
+# Reloading Postfix configuration
+systemctl reload postfix
+
+# Test email sending
+echo "Test email from Postfix SMTP relay" | mail -s "Test Subject" root
+
+# Verify logs
+# Check mail logs using: tail -f /var/log/mail.log
+
+# Postfix setup and test email completed
+