crm_system/VeGardInternational/helongcrm/service/backend/config/main-local.php

<?php

$config = [
    'components' => [
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => 'o83yA7NsYp3sNfG9AjO8hbXq5ejTAvyt',
        ],
        'dbCrm' => require(__DIR__ . '/../../common/config/db.php'),
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'useFileTransport' => false,
            'transport' => [
                'class' => 'Swift_SmtpTransport',
                'host' => 'smtp.sendgrid.net',
                'username' => 'apikey',
                'password' => "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",
                'port' => '465',
                'encryption' => 'ssl',
            ],
            'messageConfig' => [
                'charset' => 'UTF-8',
                'from' => ['admin@vegardmkt.com' => 'Vegard']
            ],

        ],
    ],
];

if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
    ];

    $config['bootstrap'][] = 'gii';
    $config['modules']['gii'] = [
        'class' => 'yii\gii\Module',
    ];
}

return $config;