NotifySender throws UnsupportedDataTypeException

[Evert Tigchelaar <e....@minihouse.com>]

Hi, I am new to James and I want to send a notification message to the 
sender of an e-mail when it has been delivered
to the receiver. The NotifySender (from the 
org.apache.james.transport.mailets package) looked like the mailet I need
but I got the following exception

exception! javax.mail.MessagingException: Exception spooling message: 
Exception caught while storing mail Container: ;
  nested exception is:
    javax.mail.MessagingException: Exception caught while storing mail 
Container: ;
  nested exception is:
    javax.mail.MessagingException: IOException wrapped by getMessageSize;
  nested exception is:
    javax.activation.UnsupportedDataTypeException: no object DCH for 
MIME type multipart/mixed;
    boundary="----=_Part_0_13305839.1157447561953";
  nested exception is:
    javax.activation.UnsupportedDataTypeException: no object DCH for 
MIME type multipart/mixed;
    boundary="----=_Part_0_13305839.1157447561953";
  nested exception is:
    javax.mail.MessagingException: IOException wrapped by getMessageSize;
  nested exception is:
    javax.activation.UnsupportedDataTypeException: no object DCH for 
MIME type multipart/mixed;
    boundary="----=_Part_0_13305839.1157447561953";
  nested exception is:
    javax.activation.UnsupportedDataTypeException: no object DCH for 
MIME type multipart/mixed;
    boundary="----=_Part_0_13305839.1157447561953"

What could be wrong?

Thanks,
Evert

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