RHEL7 Postfix config script

#/!bin/bash
##
## Install and configure postfix for sending mail
## 2016-05-01 - Mark Hillis (IBM)
##

# Check redhat version
if grep -q 7. /etc/redhat-release ;
then
  echo -ne "Release supported: " && cat /etc/redhat-release
else
  echo "RHEL Release not supported"
  exit 1
fi

# Check if being run as root user.
if [ "$EUID" -ne 0 ]
  then echo "Please run this script as root user."
  exit 1
fi

echo "###############################################################"
echo ""
echo " This script will install and configure postfix on this server."
echo ""
echo " This script assumes run subscription was previously setup."
echo ""
echo "##############################################################"
echo -n "Please press [enter] to continue or [crtl]^c to exit.."
read

# Install Postfix from RHEL repository
yum install -y postfix 1>&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** postfix install succeeded."
  else
    echo "*** postfix install failed."
  # exit 1
  fi

# Allow smtp service through firewall
firewall-cmd --permanent --add-service=smtp >&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Firewall rules updated sucessfully"
  else
    echo "*** Firewall rules failed."
  # exit 1
  fi

# Reload firewall with new rules
firewall-cmd --reload >&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Firewall reloaded sucessfully"
  else
    echo "*** Firewall reload failed."
  # exit 1
  fi

# Add post fix to startup
systemctl enable postfix 1>&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** postfix enabled successfully"
  else
    echo "*** postfix unable to add to startup"
  # exit 1
  fi

# Start postfix daemon
systemctl restart postfix 1>&2

# Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** postfix started successfully"
  else
    echo "*** postfix failed to start"
  # exit 1
  fi

# Backup default config
  if [ -f /etc/postfix/main.cf ];
  then
      mv /etc/postfix/main.cf /etc/postfix/main.cf.old.$(date +"%Y%m%d%H%M") 1>&2
  fi

# Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Config backup successful"
  else
    echo "*** Unable to backup config files"
  # exit 1
  fi

## Create new postfix config file: /etc/postfix/main.cf
echo "*** Staging settings for postfix config file.."

# Config Postfix Seting myhostname
myhostname="$HOSTNAME"
read -e -i"$myhostname" -p "enter hostname: " myhostname
myhostname="${input:-$myhostname}"
#myhostname = servername

#Config Postfix seting mydomain
mydomain="ibm.com"
read -e -i "$mydomain" -p "enter domain name: " mydomain
mydomain="${input:-$mydomain}"
#mydomain = example.com

# Config Postfix setting myorigin
myorigin="ibm.com"
read -e -i "$myorigin" -p "enter origin domain: " myorigin
myorigin="${input:-$myorigin}"
#myorigin = $mydomain

# Config Postfix setting inet_interfaces
eth="all"
read -e -i "$eth" -p "enter allowed interfaces: " eth
eth="${input:-$eth}"
#inet_interfaces = all

# Config Postfix setting mydestinaion
mydestination="$myhostname, localhost.$mydomain, localhost, $mydomain"

# Config Postfix setting my networks
mynetworks="10.0.0.1/24, 127.0.0.0/8"
read -e -i "$mynetworks" -p "enter allowed Networks : " mynetworks
mynetworks="${input:-$mynetworks}"
#mynetworks = 192.168.1.0/24, 127.0.0.0/8

echo " *** Please review settings.."
echo ""
echo "myhostname = $myhostname
mydomain = $mydomain
myorigin = $myorigin
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = $mynetworks"
echo ""
read -p "*** Press [Enter] to continue.."

# Write Postfix config file to /etc/postfix/main.cf
echo "queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
myhostname = $myhostname.$mydomain
mydomain = $mydomain
myorigin = $myorigin
mynetworks = $mynetworks
inet_interfaces = $eth
inet_protocols = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
unknown_local_recipient_reject_code = 550
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
debug_peer_level = 2
debugger_command =
     PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
     ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
sample_directory = /usr/share/doc/postfix-2.10.1/samples
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
" > /etc/postfix/main.cf

# Check postfix configs
postfix check 1>&2

# Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Postfix check passed"
  else
    echo "*** Postfix check failed"
  # exit 1
  fi

# check postfix non-default config
postconf -n 1>&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Postfix custom check passed."
  else
    echo "*** Postfix custom check failed."
  # exit 1
  fi

# Allow postfix for SE linux
setsebool -P allow_postfix_local_write_mail_spool on 1>&2

  # Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** Enable Postfix for SE Linux Succeeded."
  else
    echo "*** Enable Postfix for SE Linux failed."
  # exit 1
  fi

# Restart postfix daemon
systemctl restart postfix 1>&2

# Check for command return code
  if [ $? -eq 0 ]
  then
    echo "*** postfix restarted successfully"
  else
    echo "*** postfix failed to restart"
  # exit 1
  fi

echo "*** Post installation & configuration complete"
exit 0