Missing ant-javamail.jar file on Macintosh

[mail] Failed to initialise MIME mail: org.apache.tools.ant.taskdefs.email.MimeMailer

ant -f fetch all

all         load all the libraries
 antlr       load antlr libraries
 bcel        load bcel libraries
 beanshell   load beanshell support
 bsf         load bsf libraries
 debugging   internal ant debugging
 get-m2      Download the Maven2 Ant tasks
 jdepend     load jdepend libraries
 jruby       load jruby
 junit       load junit libraries
 jython      load jython
 logging     load logging libraries
 networking  load networking libraries (commons-net; jsch)
 regexp      load regexp libraries
 rhino       load rhino
 script      load script languages
 xerces      load an updated version of Xerces
 xml         load full XML libraries (xalan, resolver)