diff --git a/src/Mailer.php b/src/Mailer.php
index 69653a6..c1365bd 100644
--- a/src/Mailer.php
+++ b/src/Mailer.php
@@ -94,6 +94,8 @@ protected function makeConfig(array $config) : array
     }
 
     /**
+     * @todo Make public in version 4.0.0
+     *
      * @param string $key
      *
      * @return mixed
@@ -103,6 +105,27 @@ protected function getConfig(string $key) : mixed
         return $this->config[$key];
     }
 
+    /**
+     * @return array<string,mixed>
+     */
+    #[ArrayShape([
+        'host' => 'string',
+        'port' => 'int',
+        'tls' => 'bool',
+        'username' => 'string|null',
+        'password' => 'string|null',
+        'charset' => 'string',
+        'crlf' => 'string',
+        'connection_timeout' => 'int',
+        'response_timeout' => 'int',
+        'hostname' => 'string',
+        'keep_alive' => 'bool',
+    ])]
+    public function getConfigs() : array
+    {
+        return $this->config;
+    }
+
     public function getCrlf() : string
     {
         return (string) $this->getConfig('crlf');
diff --git a/tests/Mailers/SMTPMailerTest.php b/tests/Mailers/SMTPMailerTest.php
index c46d0c0..245d5c2 100644
--- a/tests/Mailers/SMTPMailerTest.php
+++ b/tests/Mailers/SMTPMailerTest.php
@@ -127,4 +127,11 @@ public function testLogs() : void
         $this->smtp->resetLogs();
         self::assertEmpty($this->smtp->getLogs());
     }
+
+    public function testConfigs() : void
+    {
+        foreach ($this->smtp->getConfigs() as $key => $value) {
+            self::assertIsString($key);
+        }
+    }
 }