HAProxy plugin mailers and email alerts?

[laralar]

Hello

I am new to opnsense and Haproxy plugin

Any idea where I can put mailers and email-alerts section.  For example:

3.6. Mailers
------------
It is possible to send email alerts when the state of servers changes.
If configured email alerts are sent to each mailer that is configured
in a mailers section. Email is sent to mailers using SMTP.

mailers <mailersect>
  Creates a new mailer list with the name <mailersect>. It is an
  independent section which is referenced by one or more proxies.

mailer <mailername> <ip>:<port>
  Defines a mailer inside a mailers section.

  Example:
    mailers mymailers
        mailer smtp1 192.168.0.1:587
        mailer smtp2 192.168.0.2:587

    backend mybackend
        mode tcp
        balance roundrobin

        email-alert mailers mymailers
        email-alert from test1@horms.org
        email-alert to test2@horms.org

        server srv1 192.168.0.30:80
        server srv2 192.168.0.31:80