diff --git a/lib/redmine/imap.rb b/lib/redmine/imap.rb
index 6e15c57e6..140131a6d 100644
--- a/lib/redmine/imap.rb
+++ b/lib/redmine/imap.rb
@@ -48,6 +48,8 @@ module Redmine
           end
         end
         imap.expunge
+        imap.logout
+        imap.disconnect
       end
 
       private