diff --git a/phpunit.dist.xml b/phpunit.dist.xml
index 22bd879..eb794bd 100644
--- a/phpunit.dist.xml
+++ b/phpunit.dist.xml
@@ -15,6 +15,7 @@
         <ini name="error_reporting" value="-1" />
         <server name="APP_ENV" value="test" force="true" />
         <server name="SHELL_VERBOSITY" value="-1" />
+        <server name="KERNEL_CLASS" value="App\Kernel" />
     </php>
 
     <testsuites>
diff --git a/src/Entity/MailConfiguration.php b/src/Entity/MailConfiguration.php
new file mode 100644
index 0000000..b1af5b1
--- /dev/null
+++ b/src/Entity/MailConfiguration.php
@@ -0,0 +1,193 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Entity;
+
+use App\Repository\MailConfigurationRepository;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: MailConfigurationRepository::class)]
+#[ORM\Table(name: 'mail_configuration')]
+class MailConfiguration
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 10)]
+    private string $protocol = 'imap';
+
+    #[ORM\Column(length: 255, nullable: true)]
+    private ?string $imapHost = null;
+
+    #[ORM\Column]
+    private int $imapPort = 993;
+
+    #[ORM\Column(length: 10)]
+    private string $imapEncryption = 'ssl';
+
+    #[ORM\Column(length: 255, nullable: true)]
+    private ?string $smtpHost = null;
+
+    #[ORM\Column]
+    private int $smtpPort = 465;
+
+    #[ORM\Column(length: 10)]
+    private string $smtpEncryption = 'ssl';
+
+    #[ORM\Column(length: 255, nullable: true)]
+    private ?string $username = null;
+
+    #[ORM\Column(type: 'text', nullable: true)]
+    private ?string $encryptedPassword = null;
+
+    #[ORM\Column(length: 255)]
+    private string $sentFolderPath = 'Sent';
+
+    #[ORM\Column(type: 'boolean')]
+    private bool $enabled = false;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getProtocol(): string
+    {
+        return $this->protocol;
+    }
+
+    public function setProtocol(string $protocol): static
+    {
+        $this->protocol = $protocol;
+
+        return $this;
+    }
+
+    public function getImapHost(): ?string
+    {
+        return $this->imapHost;
+    }
+
+    public function setImapHost(?string $imapHost): static
+    {
+        $this->imapHost = $imapHost;
+
+        return $this;
+    }
+
+    public function getImapPort(): int
+    {
+        return $this->imapPort;
+    }
+
+    public function setImapPort(int $imapPort): static
+    {
+        $this->imapPort = $imapPort;
+
+        return $this;
+    }
+
+    public function getImapEncryption(): string
+    {
+        return $this->imapEncryption;
+    }
+
+    public function setImapEncryption(string $imapEncryption): static
+    {
+        $this->imapEncryption = $imapEncryption;
+
+        return $this;
+    }
+
+    public function getSmtpHost(): ?string
+    {
+        return $this->smtpHost;
+    }
+
+    public function setSmtpHost(?string $smtpHost): static
+    {
+        $this->smtpHost = $smtpHost;
+
+        return $this;
+    }
+
+    public function getSmtpPort(): int
+    {
+        return $this->smtpPort;
+    }
+
+    public function setSmtpPort(int $smtpPort): static
+    {
+        $this->smtpPort = $smtpPort;
+
+        return $this;
+    }
+
+    public function getSmtpEncryption(): string
+    {
+        return $this->smtpEncryption;
+    }
+
+    public function setSmtpEncryption(string $smtpEncryption): static
+    {
+        $this->smtpEncryption = $smtpEncryption;
+
+        return $this;
+    }
+
+    public function getUsername(): ?string
+    {
+        return $this->username;
+    }
+
+    public function setUsername(?string $username): static
+    {
+        $this->username = $username;
+
+        return $this;
+    }
+
+    public function getEncryptedPassword(): ?string
+    {
+        return $this->encryptedPassword;
+    }
+
+    public function setEncryptedPassword(?string $encryptedPassword): static
+    {
+        $this->encryptedPassword = $encryptedPassword;
+
+        return $this;
+    }
+
+    public function getSentFolderPath(): string
+    {
+        return $this->sentFolderPath;
+    }
+
+    public function setSentFolderPath(string $sentFolderPath): static
+    {
+        $this->sentFolderPath = $sentFolderPath;
+
+        return $this;
+    }
+
+    public function isEnabled(): bool
+    {
+        return $this->enabled;
+    }
+
+    public function setEnabled(bool $enabled): static
+    {
+        $this->enabled = $enabled;
+
+        return $this;
+    }
+
+    public function hasPassword(): bool
+    {
+        return null !== $this->encryptedPassword;
+    }
+}
diff --git a/src/Repository/MailConfigurationRepository.php b/src/Repository/MailConfigurationRepository.php
new file mode 100644
index 0000000..9be3993
--- /dev/null
+++ b/src/Repository/MailConfigurationRepository.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Repository;
+
+use App\Entity\MailConfiguration;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class MailConfigurationRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, MailConfiguration::class);
+    }
+
+    public function findSingleton(): ?MailConfiguration
+    {
+        return $this->createQueryBuilder('m')
+            ->setMaxResults(1)
+            ->getQuery()
+            ->getOneOrNullResult()
+        ;
+    }
+}
diff --git a/tests/Unit/Repository/MailConfigurationRepositoryTest.php b/tests/Unit/Repository/MailConfigurationRepositoryTest.php
new file mode 100644
index 0000000..f903ee6
--- /dev/null
+++ b/tests/Unit/Repository/MailConfigurationRepositoryTest.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Repository;
+
+use App\Entity\MailConfiguration;
+use App\Repository\MailConfigurationRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * @internal
+ */
+class MailConfigurationRepositoryTest extends KernelTestCase
+{
+    private MailConfigurationRepository $repository;
+    private EntityManagerInterface $em;
+
+    protected function setUp(): void
+    {
+        self::bootKernel();
+        $container        = static::getContainer();
+        $this->repository = $container->get(MailConfigurationRepository::class);
+        $this->em         = $container->get('doctrine.orm.entity_manager');
+        $this->em->getConnection()->executeStatement('TRUNCATE TABLE mail_configuration RESTART IDENTITY CASCADE');
+    }
+
+    public function testFindSingletonReturnsNullWhenEmpty(): void
+    {
+        $result = $this->repository->findSingleton();
+
+        self::assertNull($result);
+    }
+
+    public function testFindSingletonReturnsFirstRecord(): void
+    {
+        $config = new MailConfiguration();
+        $config->setImapHost('ssl0.ovh.net');
+        $config->setEnabled(false);
+        $this->em->persist($config);
+        $this->em->flush();
+
+        $result = $this->repository->findSingleton();
+
+        self::assertInstanceOf(MailConfiguration::class, $result);
+        self::assertSame('ssl0.ovh.net', $result->getImapHost());
+        self::assertFalse($result->isEnabled());
+    }
+}