diff --git a/config/mailator.php b/config/mailator.php
index dab7be5440a5..d9282568f949 100644
--- a/config/mailator.php
+++ b/config/mailator.php
@@ -63,4 +63,14 @@
             Binarcode\LaravelMailator\Replacers\SampleReplacer::class,
         ],
     ],
+
+    'serialization' => [
+        /*
+        > Controls constructor property accessibility in mailable objects for PostgreSQL compatibility.
+        > When set to false, allows private/protected properties. When true, enforces
+        > public properties only to prevent PostgreSQL serialization errors caused by
+        > null bytes (\x00) in non-public properties.
+        */
+        'enforce_public_properties' => false,
+    ]
 ];
diff --git a/src/Models/MailatorSchedule.php b/src/Models/MailatorSchedule.php
index 6fa7ac509496..b3a840d66cb8 100644
--- a/src/Models/MailatorSchedule.php
+++ b/src/Models/MailatorSchedule.php
@@ -28,6 +28,8 @@
 use Illuminate\Support\Facades\Validator;
 use Illuminate\Support\Str;
 use Opis\Closure\SerializableClosure;
+use ReflectionClass;
+use RuntimeException;
 use Throwable;
 use TypeError;
 
@@ -106,6 +108,10 @@ public static function init(string $name): self
 
     public function mailable(Mailable $mailable): self
     {
+        if (config('mailator.serialization.enforce_public_properties') && $this->hasNonPublicConstructorProps($mailable)) {
+            throw new RuntimeException('Mailable contains non-public constructor properties which cannot be safely serialized');
+        }
+
         if ($mailable instanceof Constraintable) {
             collect($mailable->constraints())
                 ->filter(fn ($constraint) => $constraint instanceof SendScheduleConstraint)
@@ -598,4 +604,19 @@ public function save(array $options = [])
 
         return parent::save($options);
     }
+
+    private function hasNonPublicConstructorProps(Mailable $mailable): bool
+    {
+        $reflection = new ReflectionClass($mailable);
+        $constructor = $reflection->getConstructor();
+
+        if (! $constructor) {
+            return false;
+        }
+
+        return collect($constructor->getParameters())
+            ->filter(fn ($param) => $reflection->getProperty($param->getName())->isPrivate()
+                || $reflection->getProperty($param->getName())->isProtected())
+            ->isNotEmpty();
+    }
 }
diff --git a/tests/Feature/AllowNonPublicPropertiesTest.php b/tests/Feature/AllowNonPublicPropertiesTest.php
new file mode 100644
index 000000000000..b964cf4e9c41
--- /dev/null
+++ b/tests/Feature/AllowNonPublicPropertiesTest.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Binarcode\LaravelMailator\Tests\Feature;
+
+use Binarcode\LaravelMailator\Models\MailatorSchedule;
+use Binarcode\LaravelMailator\Tests\Fixtures\PrivatePropertyMailable;
+use Binarcode\LaravelMailator\Tests\Fixtures\ProtectedPropertyMailable;
+use Binarcode\LaravelMailator\Tests\Fixtures\PublicPropertyMailable;
+use Binarcode\LaravelMailator\Tests\TestCase;
+use Illuminate\Support\Facades\Mail;
+use RuntimeException;
+
+class AllowNonPublicPropertiesTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        Mail::fake();
+    }
+
+    public function test_can_send_email_with_private_property(): void
+    {
+        config()->set('mailator.serialization.enforce_public_properties', false);
+
+        MailatorSchedule::init('private')
+            ->mailable(new PrivatePropertyMailable('test'))
+            ->execute();
+
+        Mail::assertSent(PrivatePropertyMailable::class);
+    }
+
+    public function test_can_not_send_email_with_private_property(): void
+    {
+        config()->set('mailator.serialization.enforce_public_properties', true);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Mailable contains non-public constructor properties which cannot be safely serialized');
+
+        MailatorSchedule::init('private')
+            ->mailable(new PrivatePropertyMailable('test'))
+            ->execute();
+    }
+
+    public function test_can_send_email_with_protected_property(): void
+    {
+        config()->set('mailator.serialization.enforce_public_properties', false);
+
+        MailatorSchedule::init('protected')
+            ->mailable(new ProtectedPropertyMailable('test'))
+            ->execute();
+
+        Mail::assertSent(ProtectedPropertyMailable::class);
+    }
+
+    public function test_can_not_send_email_with_protected_property(): void
+    {
+        config()->set('mailator.serialization.enforce_public_properties', true);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Mailable contains non-public constructor properties which cannot be safely serialized');
+
+        MailatorSchedule::init('protected')
+            ->mailable(new ProtectedPropertyMailable('test'))
+            ->execute();
+    }
+
+    public function test_can_send_email_with_public_property(): void
+    {
+        config()->set('mailator.serialization.enforce_public_properties', true);
+
+        MailatorSchedule::init('protected')
+            ->mailable(new PublicPropertyMailable('test'))
+            ->execute();
+
+        Mail::assertSent(PublicPropertyMailable::class);
+
+        config()->set('mailator.serialization.enforce_public_properties', false);
+
+        MailatorSchedule::init('protected')
+            ->mailable(new PublicPropertyMailable('test'))
+            ->execute();
+    }
+}
diff --git a/tests/Fixtures/PrivatePropertyMailable.php b/tests/Fixtures/PrivatePropertyMailable.php
new file mode 100644
index 000000000000..71e626c9c723
--- /dev/null
+++ b/tests/Fixtures/PrivatePropertyMailable.php
@@ -0,0 +1,24 @@
+<?php
+
+
+namespace Binarcode\LaravelMailator\Tests\Fixtures;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class PrivatePropertyMailable extends Mailable
+{
+    use Queueable;
+    use SerializesModels;
+
+    public function __construct(
+        private string $name
+    ) {
+    }
+
+    public function build()
+    {
+        return $this->view('laravel-mailator::mails.stub_invoice_reminder_view');
+    }
+}
diff --git a/tests/Fixtures/ProtectedPropertyMailable.php b/tests/Fixtures/ProtectedPropertyMailable.php
new file mode 100644
index 000000000000..18922eae6c49
--- /dev/null
+++ b/tests/Fixtures/ProtectedPropertyMailable.php
@@ -0,0 +1,24 @@
+<?php
+
+
+namespace Binarcode\LaravelMailator\Tests\Fixtures;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class ProtectedPropertyMailable extends Mailable
+{
+    use Queueable;
+    use SerializesModels;
+
+    public function __construct(
+        protected string $name
+    ) {
+    }
+
+    public function build()
+    {
+        return $this->view('laravel-mailator::mails.stub_invoice_reminder_view');
+    }
+}
diff --git a/tests/Fixtures/PublicPropertyMailable.php b/tests/Fixtures/PublicPropertyMailable.php
new file mode 100644
index 000000000000..024d260a72ce
--- /dev/null
+++ b/tests/Fixtures/PublicPropertyMailable.php
@@ -0,0 +1,24 @@
+<?php
+
+
+namespace Binarcode\LaravelMailator\Tests\Fixtures;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class PublicPropertyMailable extends Mailable
+{
+    use Queueable;
+    use SerializesModels;
+
+    public function __construct(
+        public string $name
+    ) {
+    }
+
+    public function build()
+    {
+        return $this->view('laravel-mailator::mails.stub_invoice_reminder_view');
+    }
+}