No Message Collected

[Bill Omer]

Since upgrading to version 4, I'm having lots of complains about
duplicate messages being delivered, with one of the copies containing
only the following in the message body:
<<< No Message Collected >>>

>From what I understand, this is caused when the DATA connection is
terminated during the communication to sendmail.  However, I'm not sure
why two copies of the same message would be sent, with only failing and
the other not.

Has anyone noticed this before?  Any ideas what could be causing this or
how to work around it?

Regards,
Bill Omer