diff --git a/lib/mail/network/delivery_methods/smtp.rb b/lib/mail/network/delivery_methods/smtp.rb
index d9070ef1e..deedde93a 100644
--- a/lib/mail/network/delivery_methods/smtp.rb
+++ b/lib/mail/network/delivery_methods/smtp.rb
@@ -88,8 +88,8 @@ class SMTP
       :openssl_verify_mode  => nil,
       :ssl                  => nil,
       :tls                  => nil,
-      :open_timeout         => nil,
-      :read_timeout         => nil
+      :open_timeout         => 5,
+      :read_timeout         => 5
     }
 
     def initialize(values)