small review (added ToC, remove unneeded details or optional stuff)

How-to-install-fail2ban-packages.md

@@ -1,4 +1,9 @@
-## CentOS/CentOS Stream/RHEL Based Operating Systems
+- [CentOS / RHEL Based](#[centoscentos-streamrhel-based-operating-systems](#centos--centos-stream--rhel-based-operating-systems))
+- [Debian / Ubuntu](#debian--ubuntu)
+- [Fedora](#fedora)
+- [another](#if-your-system-is-not-listed)
+
+## CentOS / CentOS Stream / RHEL Based Operating Systems
 
 Ensure your system is up to date and install the EPEL repository:
 
@@ -8,42 +13,27 @@ Install Fail2Ban:
 
     yum install fail2ban
 
-For email support, install Sendmail:
-
-    yum install sendmail
-
-Start and enable Fail2ban and, if needed, Sendmail:
+Start and enable Fail2ban:
 
     systemctl start fail2ban
     systemctl enable fail2ban
-    systemctl start sendmail
-    systemctl enable sendmail
 
 If you encounter the error that there is `no directory /var/run/fail2ban to contain the socket file /var/run/fail2ban/fail2ban.sock`, create the directory manually:
 
     mkdir /var/run/fail2ban
 
-## Debian
+## Debian / Ubuntu
 
 Ensure your system is up to date:
 
-    apt-get update && apt-get upgrade -y
+    apt update && apt upgrade
+
 Install Fail2ban:
 
-    apt-get install fail2ban
+    apt install fail2ban
     
 The service automatically starts.
 
-For email support, install Sendmail:
-
-    apt-get install sendmail-bin sendmail
-
-The current version of Sendmail in Debian Jessie has an upstream bug which causes the following errors when installing sendmail-bin. The installation hangs for a minute, but then complete.
-
-Creating /etc/mail/sendmail.cf...
-ERROR: FEATURE() should be before MAILER() MAILER('local') must appear after FEATURE('always_add_domain')
-ERROR: FEATURE() should be before MAILER() MAILER('local') must appear after FEATURE('allmasquerade')
-
 ## Fedora
 
 Update your system:
@@ -54,38 +44,13 @@ Install Fail2ban:
 
     dnf install fail2ban
     
-For email support, install Sendmail:
-
-    dnf install sendmail
-    
-Start and enable Fail2ban and, if needed, Sendmail:
+Start and enable Fail2ban:
 
     systemctl start fail2ban
     systemctl enable fail2ban
-    systemctl start sendmail
-    systemctl enable sendmail
-    
-## Ubuntu
-
-Ensure your system is up to date:
-
-    apt-get update && apt-get upgrade -y
-
-Install Fail2ban:
-
-    apt-get install fail2ban
-    
-The service automatically starts.
-
-For email support, install Sendmail:
-
-    apt-get install sendmail
-    
-Allow SSH access through UFW and then enable the firewall:
-
-    ufw allow ssh
-    ufw enable
 
 ## if your system is not listed
 
-You can [install the packages manually](https://github.com/fail2ban/fail2ban).
+Try to find fail2ban packaged for your distribution using a package management of your OS.
+
+You could also try to install it [manually](How-to-install-or-upgrade-fail2ban-manually).