change timer

src/MailKitMailModule.cs

@@ -79,7 +79,7 @@ namespace OpenSim.Modules.EMail
             m_scene = scene;
 
             m_timer_send = new Timer();
-            m_timer_send.Interval = 1000 * 3;
+            m_timer_send.Interval = 1000 * 15;
             m_timer_send.Elapsed += sendAllMails;
             m_timer_send.Enabled = true;
             m_timer_send.Start();