diff --git a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
index 513affc..acd30d4 100644
--- a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
@@ -15,6 +15,7 @@
 import gitbucket.core.util.SyntaxSugars._
 import gitbucket.core.util.{AdminAuthenticator, Mailer}
 import org.apache.commons.io.IOUtils
+import org.apache.commons.mail.EmailException
 import org.json4s.jackson.Serialization
 import org.scalatra._
 import org.scalatra.forms._
@@ -312,7 +313,8 @@
       "Test mail has been sent to: " + form.testAddress
 
     } catch {
-      case e: Exception => "[Error] " + e.toString
+      case e: EmailException => s"[Error] ${e.getCause}"
+      case e: Exception      => "[Error] " + e.toString
     }
   })