How to make zabbix appliance 3.2 as mail server and send alert to email by using gmail and stunnel

This is my little effort to explain how we can setup stunnel with zabbux and gmail,

How to install stunnel in ubuntu 14.04.5 LTS ?
How to install stunnel and configure gmail smtp  port 25 for gmail email ?
How to setup email alert in zabbix ?
How to make zabbix appliance 3.2 as mail server and send alert to email by using gmail and stunnel ?

Requerments:

1.Zabbix Appliance installed and configured
2.Stunnel
3.Gmail Account

Install stunnel and configure

Login as root and type

# apt-get install stunnel

After installation finish need to configure stunnel.

vi /etc/default/stunnel4

Change: ENABLED=0 to ENABLED=1

Save and Quit.

Create new stunnel configuration file.

# cp /usr/share/doc/stunnel4/examples/stunnel.conf-sample /etc/stunnel/stunnel.conf

edit it stunnel.conf

# vi /etc/stunnel/stunnel.conf

Remove ";" from lines

output = /var/log/stunnel4/stunnel.log
.
.
cert = /etc/stunnel/mail.pem
.
.
[pop3s]
accept  = 995
connect = 110
.
.
[imaps]
accept  = 993
connect = 143
.
[ssmtp]
accept  = 465
connect = 25
.
.
[gmail-smtp]
client = yes
accept = 172.16.200.200:25
connect = smtp.gmail.com:465
.
.

After add above details then Save and Quit VI Editor.

Then Create an Open SSL Certificate to with work Stunnel .

# cd /etc/stunnel

# openssl req -new -out mail.pem -keyout mail.pem -nodes -x509 -days 365 

Start stop or restart STunnel

# sudo /etc/init.d/stunnel4 stop

# sudo /etc/init.d/stunnel4 start 

# sudo /etc/init.d/stunnel4 restart

If it is startling without any error, configuration is success.Otherwise need to troubleshoot it.

To verify the service is running or not  ,
Just gor to any machine that is in the same network and do telnet to port 25.
In Windows OS,


Go to CMD
type
telnet 172.16.200.200 25

If it is not showing any failure message and established connection to port 25 means configuration is success.

Some times there is a chance to block port 25 by  Ubuntu firewall iptables.
so we need to add an exception in firewall iptables.

Add Port exception in Ubuntu firewall iptables.

Check first the firewall in ubuntu
# ptables -L -n

Then add port in firewall

# iptables -I INPUT -p tcp -m tcp --dport 25 -j ACCEPT

Then check again by doing telnet from any of outside machine .If it is success go to next steps,
Configure email settings in Zabbix

Go to Zabbix - Administration - Media Type

Then Update. After got to Zabbix - Administration - Users
Choose any user and edit media type as shown below,

If you are using gmail for zabbix smtp alert, You should need to setup enable  "Allow Less secure App : ON"

After that you need to configure an action trigger for testing this setup.
Before make an action you should have Hosts configured in Zabbix.
If you want to know how to configure host in zabbix follow below link ,

Link will update soon

Now go to Zabbix - Configuration - Action

Type a name,
New condition - Choose trigger - and browse your already configured (In host)server -  and select any of trigger , Here I choose MytestServer (My server Name) is Unavailable by ICMP.
Then Go to Operations - New

Configure like above picture,
Then Setup Recovery Operations

Refer above picture.
Then update and save all settings.

After that Test email setup by stop ping or shutdown Server,then check your e-mail after 3 minute.Default Zabbix ICMP trigger is 3 minute.

If the tutorial help you, please comment below.

Thank you.