diff --git a/lib/email_template_interceptor.rb b/lib/email_template_interceptor.rb
index fb04a7824b82ef9a6efa180871e0b1d8ebc50aaa..63f9f8d7a5af7f071ab66a34f11c4d67c09550c1 100644
--- a/lib/email_template_interceptor.rb
+++ b/lib/email_template_interceptor.rb
@@ -5,8 +5,8 @@ class EmailTemplateInterceptor
   def self.delivering_email(message)
     # Remove HTML part if HTML emails are disabled.
     unless current_application_settings.html_emails_enabled
-      message.part.delete_if do |part|
-        part.content_type.try(:start_with?, 'text/html')
+      message.parts.delete_if do |part|
+        part.content_type.start_with?('text/html')
       end
     end
   end