SMTP Mail Sending Issue

========== The output of ./validate.php ==================

[librenms@ngd-dc2-librenms ~]$  ./validate.php
====================================
Component | Version
--------- | -------
LibreNMS  | 22.1.0-39-gfdebee86b
DB Schema | 2021_12_02_113537_ports_stp_designated_cost_change_to_int (234)
PHP       | 7.3.20
Python    | 3.6.8
MySQL     | 10.3.28-MariaDB
RRDTool   | 1.7.0
SNMP      | 5.8
====================================

[OK]    Composer Version: 2.1.9
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct
======================================

================ The problem ====================

I have configured SMTP for alerting. The SMTP server is reachable from librenms server. However, when I am trying to send mail alert, its getting failed. While checking the issue, we have found that the sender email address is being input as receiver email address. For this reason we are getting authentication error.

Please find the test alert output and mail.php file configuration(as per instruction I did not modify it) as following:
============= Error Screen Shot ========================

=================== Mail.php =========================

more /opt/librenms/config/mail.php

<?php

/*
 | !!!! DO NOT EDIT THIS FILE !!!!
 |
 | You can change settings by setting them in the environment or .env
 | If there is something you need to change, but is not available as an environment setting,
 | request an environment variable to be created upstream or send a pull request.
 */

return [

    /*
    |--------------------------------------------------------------------------
    | Default Mailer
    |--------------------------------------------------------------------------
    |
    | This option controls the default mailer that is used to send any email
    | messages sent by your application. Alternative mailers may be setup
    | and used as needed; however, this mailer will be used by default.
    |
    */

    'default' => env('MAIL_MAILER', 'smtp'),

    /*
    |--------------------------------------------------------------------------
    | Mailer Configurations
    |--------------------------------------------------------------------------
    |
    | Here you may configure all of the mailers used by your application plus
    | their respective settings. Several examples have been configured for
    | you and you are free to add your own as your application requires.
    |
    | Laravel supports a variety of mail "transport" drivers to be used while
    | sending an e-mail. You will specify which one you are using for your
    | mailers below. You are free to add additional mailers as required.
    |
    | Supported: "smtp", "sendmail", "mailgun", "ses",
    |            "postmark", "log", "array"
    |
    */

    'mailers' => [
        'smtp' => [
            'transport' => 'smtp',
            'host' => env('MAIL_HOST', 'smtp.mailgun.org'),
            'port' => env('MAIL_PORT', 587),
            'encryption' => env('MAIL_ENCRYPTION', 'tls'),
            'username' => env('MAIL_USERNAME'),
            'password' => env('MAIL_PASSWORD'),
            'timeout' => null,
            'auth_mode' => null,
        ],

        'ses' => [
            'transport' => 'ses',
        ],

        'mailgun' => [
            'transport' => 'mailgun',
        ],

        'postmark' => [
            'transport' => 'postmark',
        ],

        'sendmail' => [
            'transport' => 'sendmail',
            'path' => '/usr/sbin/sendmail -bs',
        ],

        'log' => [
            'transport' => 'log',
            'channel' => env('MAIL_LOG_CHANNEL'),
        ],

        'array' => [
            'transport' => 'array',
        ],

        'failover' => [
            'transport' => 'failover',
            'mailers' => [
                'smtp',
                'log',
            ],
        ],
    ],

    /*
    |--------------------------------------------------------------------------
    | Global "From" Address
    |--------------------------------------------------------------------------
    |
    | You may wish for all e-mails sent by your application to be sent from
    | the same address. Here, you may specify a name and address that is
    | used globally for all e-mails that are sent by your application.
    |
    */

    'from' => [
        'address' => env('MAIL_FROM_ADDRESS', '[email protected]'),
        'name' => env('MAIL_FROM_NAME', 'Example'),
    ],

    /*
    |--------------------------------------------------------------------------
    | Markdown Mail Settings
    |--------------------------------------------------------------------------
    |
    | If you are using Markdown based email rendering, you may configure your
    | theme and component paths here, allowing you to customize the design
    | of the emails. Or, you may simply stick with the Laravel defaults!
    |
    */

    'markdown' => [
        'theme' => 'default',

        'paths' => [
            resource_path('views/vendor/mail'),
        ],
    ],

];

You need to set the config options as per:

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