diff --git a/.gitignore b/.gitignore
index 18ba65e..a9a8d5f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,5 @@ vendor
 .project
 .settings
 
-.idea
\ No newline at end of file
+.idea
+composer.lock
\ No newline at end of file
diff --git a/src/Message/MailerQ/Rest/MessageFacade.php b/src/Message/MailerQ/Rest/MessageFacade.php
index 4de3316..5965901 100644
--- a/src/Message/MailerQ/Rest/MessageFacade.php
+++ b/src/Message/MailerQ/Rest/MessageFacade.php
@@ -53,7 +53,7 @@ public static function convert(\G4\Mailer\Message $message, array $options)
         ];
 
         if (isset($options[self::PARAMS][self::SMARTHOST])) {
-            $body[self::MIME][self::SMARTHOST] = $options[self::PARAMS][self::SMARTHOST];
+            $body[self::SMARTHOST] = $options[self::PARAMS][self::SMARTHOST];
         }
 
         if ($message->getLogId()) {
@@ -95,4 +95,4 @@ private static function getTags($headers)
             throw new \RuntimeException(sprintf('Tags are not resolved. Reason: %s', $exception->getMessage()));
         }
     }
-}
\ No newline at end of file
+}