diff --git a/src/main/org/apache/tools/ant/taskdefs/defaults.properties b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
index 10902ad04..1a2453597 100644
--- a/src/main/org/apache/tools/ant/taskdefs/defaults.properties
+++ b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
@@ -106,6 +106,7 @@ vsscheckin=org.apache.tools.ant.taskdefs.optional.vss.MSVSSCHECKIN
 vsscheckout=org.apache.tools.ant.taskdefs.optional.vss.MSVSSCHECKOUT
 iplanet-ejbc=org.apache.tools.ant.taskdefs.optional.ejb.IPlanetEjbcTask
 jdepend=org.apache.tools.ant.taskdefs.optional.jdepend.JDependTask
+mimemail=org.apache.tools.ant.taskdefs.optional.net.MimeMail
 
 # deprecated ant tasks (kept for back compatibility)
 javadoc2=org.apache.tools.ant.taskdefs.Javadoc