diff --git a/src/Email/SymfonyMailer.php b/src/Email/SymfonyMailer.php
index ff46b3e..3cbb340 100644
--- a/src/Email/SymfonyMailer.php
+++ b/src/Email/SymfonyMailer.php
@@ -14,11 +14,13 @@ class SymfonyMailer implements MailerInterface
     public function __construct(EmailConfiguration $configuration) {
         $this->emailConfiguration = $configuration;
 
-        if ($this->emailConfiguration->smtpUsername) {
-            $this->mailer = new Mailer(Transport::fromDsn(sprintf("smtp://%s:%s@%s:%d?verify_peer=%s", $this->emailConfiguration->smtpUsername, $this->emailConfiguration->smtpPassword, $this->emailConfiguration->smtpHost, $this->emailConfiguration->smtpPort, $this->emailConfiguration->smtpVerifyPeer ? 'true' : 'false')));
-        }
-        else {
-            $this->mailer = new Mailer(Transport::fromDsn(sprintf("smtp://%s:%d?verify_peer=%s", $this->emailConfiguration->smtpHost, $this->emailConfiguration->smtpPort, $this->emailConfiguration->smtpVerifyPeer ? 'true' : 'false')));
+        if ($this->emailConfiguration->smtpHost) {
+            if ($this->emailConfiguration->smtpUsername) {
+                $this->mailer = new Mailer(Transport::fromDsn(sprintf("smtp://%s:%s@%s:%d?verify_peer=%s", $this->emailConfiguration->smtpUsername, $this->emailConfiguration->smtpPassword, $this->emailConfiguration->smtpHost, $this->emailConfiguration->smtpPort, $this->emailConfiguration->smtpVerifyPeer ? 'true' : 'false')));
+            }
+            else {
+                $this->mailer = new Mailer(Transport::fromDsn(sprintf("smtp://%s:%d?verify_peer=%s", $this->emailConfiguration->smtpHost, $this->emailConfiguration->smtpPort, $this->emailConfiguration->smtpVerifyPeer ? 'true' : 'false')));
+            }
         }
     }