Index: src/main/resources/org/apache/maven/continuum/web/action/notifier/MailProjectNotifierEditAction-mailProjectNotifierSave-validation.xml
===================================================================
--- src/main/resources/org/apache/maven/continuum/web/action/notifier/MailProjectNotifierEditAction-mailProjectNotifierSave-validation.xml	(revision 755816)
+++ src/main/resources/org/apache/maven/continuum/web/action/notifier/MailProjectNotifierEditAction-mailProjectNotifierSave-validation.xml	(working copy)
@@ -26,7 +26,7 @@
     <field-validator type="expression">
      <param name="expression">
         ! (
-          ( address eq "" )
+          ( address.trim() eq "" )
           and
           ( committers eq "" )
           )
Index: src/main/resources/org/apache/maven/continuum/web/action/notifier/MailGroupNotifierEditAction-mailProjectGroupNotifierSave-validation.xml
===================================================================
--- src/main/resources/org/apache/maven/continuum/web/action/notifier/MailGroupNotifierEditAction-mailProjectGroupNotifierSave-validation.xml	(revision 755816)
+++ src/main/resources/org/apache/maven/continuum/web/action/notifier/MailGroupNotifierEditAction-mailProjectGroupNotifierSave-validation.xml	(working copy)
@@ -26,7 +26,7 @@
     <field-validator type="expression">
       <param name="expression">
         ! (
-          ( address eq "" )
+          ( address.trim() eq "")
           and
           ( committers eq "" )
           )