diff --git a/Lib/test/test_rfc822.py b/Lib/test/test_rfc822.py
index 0d4c66f..36e7a51 100644
--- a/Lib/test/test_rfc822.py
+++ b/Lib/test/test_rfc822.py
@@ -120,3 +120,7 @@
 
 test''', [('', 'goit@lip.com')])
 
+
+test('''To: guido@[132.151.1.21]
+
+foo''', [('', 'guido@[132.151.1.21]')])