diff --git a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
index ea8bcf4dbb..ed9bea8d80 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
+++ b/src/Symfony/Component/Mailer/Bridge/Mailchimp/Http/MandrillTransport.php
@@ -42,7 +42,7 @@ class MandrillTransport extends AbstractHttpTransport
             'json' => [
                 'key' => $this->key,
                 'to' => $this->stringifyAddresses($envelope->getRecipients()),
-                'from_email' => $envelope->getSender()->toString(),
+                'from_email' => $envelope->getSender()->getAddress(),
                 'raw_message' => $message->toString(),
             ],
         ]);