diff --git a/backend/.env.example b/backend/.env.example
index c5ee655b31..d1db304f71 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -50,6 +50,8 @@ MAIL_PORT=1025
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
+MAIL_AUTO_TLS=true
+MAIL_VERIFY_PEER=true
 MAIL_FROM_ADDRESS="hello@example.com"
 MAIL_FROM_NAME="${APP_NAME}"
 
diff --git a/backend/config/mail.php b/backend/config/mail.php
index 5bb2254529..c64277f391 100644
--- a/backend/config/mail.php
+++ b/backend/config/mail.php
@@ -44,6 +44,8 @@
             'password' => env('MAIL_PASSWORD'),
             'timeout' => null,
             'local_domain' => env('MAIL_EHLO_DOMAIN'),
+            'auto_tls' => env('MAIL_AUTO_TLS', true),
+            'verify_peer' => env('MAIL_VERIFY_PEER', true),
         ],
 
         'ses' => [
diff --git a/backend/tests/Unit/Configuration/MailConfigurationTest.php b/backend/tests/Unit/Configuration/MailConfigurationTest.php
new file mode 100644
index 0000000000..7dbe1d1a9b
--- /dev/null
+++ b/backend/tests/Unit/Configuration/MailConfigurationTest.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Tests\Unit\Configuration;
+
+use Illuminate\Mail\MailManager;
+use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
+use Tests\TestCase;
+
+class MailConfigurationTest extends TestCase
+{
+    public function test_smtp_transport_can_disable_opportunistic_starttls(): void
+    {
+        config([
+            'mail.mailers.smtp' => array_merge(config('mail.mailers.smtp'), [
+                'auto_tls' => false,
+                'verify_peer' => false,
+            ]),
+        ]);
+
+        /** @var MailManager $mailManager */
+        $mailManager = app('mail.manager');
+
+        $transport = $mailManager->createSymfonyTransport(config('mail.mailers.smtp'));
+
+        $this->assertInstanceOf(EsmtpTransport::class, $transport);
+        $this->assertFalse($transport->isAutoTls());
+        $this->assertFalse($transport->getStream()->getStreamOptions()['ssl']['verify_peer']);
+        $this->assertFalse($transport->getStream()->getStreamOptions()['ssl']['verify_peer_name']);
+    }
+}
diff --git a/docker/all-in-one/.env.example b/docker/all-in-one/.env.example
index 3a7b4f6130..cce1ee6b76 100644
--- a/docker/all-in-one/.env.example
+++ b/docker/all-in-one/.env.example
@@ -34,6 +34,8 @@ MAIL_PORT=1025
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
+MAIL_AUTO_TLS=true
+MAIL_VERIFY_PEER=true
 MAIL_FROM_ADDRESS=test@example.com
 MAIL_FROM_NAME="Hi Events"
 
diff --git a/docker/all-in-one/docker-compose.yml b/docker/all-in-one/docker-compose.yml
index 28f912c617..2febdb3554 100644
--- a/docker/all-in-one/docker-compose.yml
+++ b/docker/all-in-one/docker-compose.yml
@@ -31,6 +31,8 @@ services:
       - MAIL_USERNAME=${MAIL_USERNAME}
       - MAIL_PASSWORD=${MAIL_PASSWORD}
       - MAIL_ENCRYPTION=${MAIL_ENCRYPTION}
+      - MAIL_AUTO_TLS=${MAIL_AUTO_TLS}
+      - MAIL_VERIFY_PEER=${MAIL_VERIFY_PEER}
       - MAIL_FROM_ADDRESS=${MAIL_FROM_ADDRESS}
       - MAIL_FROM_NAME=${MAIL_FROM_NAME}
       - FILESYSTEM_PUBLIC_DISK=${FILESYSTEM_PUBLIC_DISK}