info about mail server options

README.md

@@ -3,6 +3,7 @@
 Base Stack installs some basic applications and configs that are common to any server build. Specifically firewald & fail2ban to lock a server down.
 
 ## Install
+
 ```
 cd /usr/local/src/
 git clone https://git.stack-source.com/msb/base-stack.git
@@ -10,6 +11,19 @@ cd base-stack
 bash install.sh
 ```
 
+## MTA
+For an integrated and full featured mail server configuration it's recommended to install vmail-stack:
+https://git.stack-source.com/msb/vmail-stack
+If you just want a minimal smtp mail server for getting automated emails (cron, website contact forms, etc.) off the server you can install and configure exim4-daemon-light with these commands:
+
+```
+apt -y install exim4-daemon-light mailutils
+sed -i "s|dc_eximconfig_configtype='local'|dc_eximconfig_configtype='internet'|g" /etc/exim4/update-exim4.conf.conf
+/usr/sbin/update-exim4.conf
+systemctl restart exim4
+echo "user@example.com" > /root/.forward
+```
+
 ## License
 Copyright (c) 2022 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>\
 GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

install.sh

@@ -9,7 +9,7 @@
 
 # require root
 if [ "${EUID}" -ne 0 ]; then
-  echo "This script must be run as root"
+  echo "This script must be run as root."
   exit 1
 fi
 
@@ -17,7 +17,14 @@ fi
 os_id=`lsb_release -is`
 os_release=`lsb_release -rs`
 if [ $os_id != Ubuntu ] || [ $os_release != 22.04 ]; then
-  echo "this installer only runs on Ubuntu 22.04, bailing out"
+  echo "This installer only runs on Ubuntu 22.04, bailing out."
+  exit 1
+fi
+
+if lsof /var/lib/dpkg/lock-frontend ; then
+  echo "Could not get lock /var/lib/dpkg/lock-frontend"
+  echo "See output above for info on what is holding the lock."
+  echo "What for the command above to complete, then re-run this script."
   exit 1
 fi
 
@@ -132,3 +139,4 @@ cp sbin/* /usr/local/sbin/
 echo ""
 echo "Unattended upgrades & fail2ban are configured to send notifications to $WEBMASTER."
 echo "Update /etc/apt/apt.conf.d/50unattended-upgrades and /etc/fail2ban/jail.local to suit your needs."
+echo "NOTE: No mail server has been installed and emails won't send without one. See the README for more info."