[4.x]: Problems with custom smtp settings

[tejubhe]

What happened?

Description

Hi I am using custom smtp setting for craftcms .
using below code in config/app.php

 'mailer' => function() {
                // Get the stored email settings
                $settings = App::mailSettings();
 
                // Override the transport adapter class
                $settings->transportType = \craft\mail\transportadapters\Smtp::class;
 
                // Override the transport adapter settings
                $settings->transportSettings = [
                    'host' => getenv('SMTP_HOST'),
                    'port' => getenv('SMTP_PORT'),
                    'useAuthentication' => getenv('SMTP_USERNAME') !== '' ? true : false,
                    'username' => getenv('SMTP_USERNAME'),
                    'password' => getenv('SMTP_PASSWORD'),
                    'encryptionMethod' => getenv('SMTP_ENCRYPTION_METHOD') !== '' ? getenv('SMTP_ENCRYPTION_METHOD') : null,
                    'timeout' => '10'
                ];
 
                $config = App::mailerConfig($settings);
                return Craft::createObject($config);
            },
            'queue' => [
                'ttr' => 600, // 300 default
            ],
            'redis' => [
                'class' => yii\redis\Connection::class,
                'hostname' => getenv('REDIS_HOST'),
                'port' => getenv('REDIS_PORT'),
                'password' => getenv('REDIS_PASSWORD') !== '' ? getenv('REDIS_PASSWORD') : NULL,
                'useSSL' => (getenv('REDIS_USE_SSL') === '1')
            ],

This issue comes after I upgraded to php 8.2.29 , Formie 2.2.5 and having Craft CMS 4.16.13 version .

2025-10-01 16:55:32 [INFO] Submission triggered for individualsForm.
2025-10-01 16:55:32 [INFO] Request context:
$_GET = []

$_POST = [
    'CRAFT_CSRF_TOKEN' => '••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••'
    'action' => 'formie/submissions/submit'
    'submitAction' => 'submit'
    'handle' => 'Form'
    'siteId' => '1'
    'fields' => [
        'firstName' => 'Test'
        'lastName' => 'Testing'
        'phoneNumber' => [
            'number' => ''
        ]
        'email' => 'test@gmail.com'
        'howMuchWouldYouLikeToDiscuss' => ''
        'reasonForEnquiry' => ''
        'iAgreeToReceiveEmail' => ''
        'referringUrl' => ''
        'pageUrl' => ''
        'utmSource' => '{{ craft.app.request.getQueryParam(\'utm_source\') }}'
        'utmMedium' => '{{ craft.app.request.getQueryParam(\'utm_medium\') }}'
        'utmCampaign' => '{{ craft.app.request.getQueryParam(\'utm_campaign\') }}'
        'utmTerm' => '{{ craft.app.request.getQueryParam(\'utm_term\') }}'
        'utmContent' => '{{ craft.app.request.getQueryParam(\'utm_content\') }}'
        'formevent' => 'hard'
    ]
    'location' => ''
    'g-recaptcha-response' => ''
]
2025-10-01 16:55:35 [INFO] Adestra: Opting-out. Field “{iAgreeToReceiveEmail}” has value “No”.
2025-10-01 16:55:35 [INFO] Adestra: Sending payload cancelled by opt-in field.
2025-10-01 16:55:35 [INFO] Request context:
$_GET = []

$_POST = []
2025-10-01 16:55:36 [ERROR] Notification email “Send to Marketing inbox” could not be sent for submission “7785588”. The mailer service failed to send the notification: “”.
2025-10-01 16:55:36 [ERROR] Email payload: {"charset":"utf-8","from":{"noreply@domain.com":"Test"},"replyTo":"","to":{"marketing@domain.com":""},"cc":"","bcc":"","sender":"","subject":"Contact form submission \","body":"<p>\n            <strong>First name<\/strong><br>\n    \n            Tejas Test\n    <\/p><p>\n            <strong>formevent<\/strong><br>\n    \n            hard\n    <\/p>"}
2025-10-01 16:55:36 [INFO] Fail alert not configured to send.
2025-10-01 16:55:36 [INFO] Request context:
$_GET = []

$_POST = []
2025-10-01 16:55:36 [ERROR] Notification email “Send to Mail inbox” could not be sent for submission “7785584”. The mailer service failed to send the notification: “”.
2025-10-01 16:55:36 [ERROR] Email payload: {"charset":"utf-8","from":{"noreply@domain.com":"Test"},"replyTo":"","to":{"marketing@domain.com":""},"cc":"","bcc":"","sender":"","subject":"Contact form submission \","body":"<p>\n            <strong>First name<\/strong><br>\n    \n            Tejas Test\n    <\/p><p>\n            <strong>formevent<\/strong><br>\n    \n            hard\n    <\/p>"}
2025-10-01 16:55:36 [INFO] Fail alert not configured to send.
2025-10-01 16:55:36 [INFO] Request context:
$_GET = []

$_POST = []

Steps to reproduce

Expected behavior

Actual behavior

Craft CMS version

4.16.13

PHP version

8.2.29

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

Also I am getting this issue in UAT and prod , when delivering mails, on localhost when i try with mailpit I am able to see the mails there., but in UAT and prod also not getting logs on SMTP relay

[linear]

CMS-1625

[brandonkelly]

Looks like these lines give some hint as to why the emails aren’t getting sent:

2025-10-01 16:55:35 [INFO] Adestra: Opting-out. Field “{iAgreeToReceiveEmail}” has value “No”.
2025-10-01 16:55:35 [INFO] Adestra: Sending payload cancelled by opt-in field.

I’m not too familiar with Formie, so not sure if that’s a Formie issue or something specific to your project. Either way, it seems intentional that the emails aren’t getting sent, and not an issue with the mailer itself.