Introduce the env variable ENABLE_FAIL2BAN.

Modified the Makefile so that the containers startup with a short delay
between each other.
Corrected a small bug in start-mailserver.sh that prevented the correct
configuration of the jails.

Makefile

@@ -21,18 +21,21 @@ run:
 		-e SA_KILL=3.0 \
 		-e SASL_PASSWD=testing \
 		-h mail.my-domain.com -t $(NAME)
+	sleep 15
 	docker run -d --name mail_pop3 \
 		-v "`pwd`/postfix":/tmp/postfix \
 		-v "`pwd`/spamassassin":/tmp/spamassassin \
 		-v "`pwd`/test":/tmp/test \
 		-e ENABLE_POP3=1 \
 		-h mail.my-domain.com -t $(NAME)
+	sleep 15
 	docker run -d --name mail_smtponly \
 		-v "`pwd`/postfix":/tmp/postfix \
 		-v "`pwd`/spamassassin":/tmp/spamassassin \
 		-v "`pwd`/test":/tmp/test \
 		-e SMTP_ONLY=1 \
 		-h mail.my-domain.com -t $(NAME)
+	sleep 15
 	docker run -d --name mail_fail2ban \
 		-v "`pwd`/postfix":/tmp/postfix \
 		-v "`pwd`/spamassassin":/tmp/spamassassin \
@@ -40,7 +43,7 @@ run:
 		-e ENABLE_FAIL2BAN=1 \
 		-h mail.my-domain.com -t $(NAME)
 	# Wait for containers to fully start
-	sleep 60
+	sleep 15
 
 fixtures:
 	# Sending test mails

start-mailserver.sh

@@ -240,7 +240,7 @@ awk 'BEGIN{unit=0}{if ($1=="[postfix]" || $1=="[couriersmtp]" || $1=="[courierau
        else if ($1=="logpath" && unit==1) $3="/var/log/mail/mail.log";
       print;
       if (unit==1 && $1~/\[/ && $1!~/postfix|couriersmtp|courierauth|sasl/) unit=0;
-}'/etc/fail2ban/jail.conf > /tmp/jail.conf.new && mv /tmp/jail.conf.new /etc/fail2ban/jail.conf && rm -f /tmp/jail.conf.new
+}' /etc/fail2ban/jail.conf > /tmp/jail.conf.new && mv /tmp/jail.conf.new /etc/fail2ban/jail.conf && rm -f /tmp/jail.conf.new
 
 # increase ban time and find time to 3h
 sed -i "/^bantime *=/c\bantime = 10800"     /etc/fail2ban/jail.conf