Gmail SMTP timeout after sending data block, Connection timed out

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@trogvar @Deepak @manuelserol @eris

and here is the patch:

	if [ -f "/etc/exim4/exim4.conf.template" ]; then 
		check_grep=$(grep -c 'hosts_try_fastopen' /etc/exim4/exim4.conf.template)
		if [ "$check_grep" -eq 0 ]; then
					echo "=== Fixing Gmail hosts_try_fastopen in Exim4"
					FIND="dkim_strict = 0"
					ADD="  hosts_try_fastopen = \!\*.l.google.com"
					sed -i "s#$FIND#$FIND\n$ADD#g" /etc/exim4/exim4.conf.template
					systemctl restart exim4
					
					sed -i "s/net.ipv4.tcp_window_scaling/#net.ipv4.tcp_window_scaling/g" /etc/sysctl.conf
					echo 1 > /proc/sys/net/ipv4/tcp_window_scaling
		fi
	fi