diff --git a/src/mailer/components/mailers/SystemMailer.php b/src/mailer/components/mailers/SystemMailer.php
index b81f6af5..b4d9ecd3 100644
--- a/src/mailer/components/mailers/SystemMailer.php
+++ b/src/mailer/components/mailers/SystemMailer.php
@@ -127,9 +127,11 @@ public function getSendTestModalHtml(EmailElement $email): string
     {
         $testToEmailAddress = Craft::$app->getConfig()->getGeneral()->testToEmailAddress;
 
-        if ($testToEmailAddress) {
+        if (!empty($testToEmailAddress)) {
             $warningMessage = Craft::t('sprout-module-mailer', 'Test email found in general config. All messages will be sent to the testToEmailAddress: {email}', [
-                'email' => $testToEmailAddress,
+                'email' => is_array($testToEmailAddress)
+                    ? implode(', ', $testToEmailAddress)
+                    : $testToEmailAddress,
             ]);
         }
 
diff --git a/src/mailer/components/mailers/fieldlayoutelements/TestToEmailUiElement.php b/src/mailer/components/mailers/fieldlayoutelements/TestToEmailUiElement.php
index d9cdf340..d5a90ae2 100644
--- a/src/mailer/components/mailers/fieldlayoutelements/TestToEmailUiElement.php
+++ b/src/mailer/components/mailers/fieldlayoutelements/TestToEmailUiElement.php
@@ -27,7 +27,9 @@ public function formHtml(?ElementInterface $element = null, bool $static = false
         $id = sprintf('warning%s', mt_rand());
 
         $message = Markdown::process(Html::encode(Craft::t('sprout-module-mailer', 'Test email found in general config. All messages will be sent to the testToEmailAddress: {email}', [
-            'email' => $testToEmailAddress,
+            'email' => is_array($testToEmailAddress)
+                ? implode(', ', $testToEmailAddress)
+                : $testToEmailAddress,
         ])));
 
         $blockquote = Html::tag('blockquote', $message, [
@@ -39,6 +41,6 @@ public function formHtml(?ElementInterface $element = null, bool $static = false
             'class' => 'readable',
         ]);
 
-        return $testToEmailAddress ? $html : null;
+        return !empty($testToEmailAddress) ? $html : null;
     }
 }