Question : PDF attachments stripped from email - doesn't make sense

Hi All,
A client of us sending invoices and statements from their accounting package and suddenly 30-40 of say 100 recepients will not receive the attached PDF.
The PDF is sent by the server (Exchange 2000) and not received on the other end.
We have done a number of tests and this is what we know:
The email certainly sent or attempted to br sent from the sender with the PDF. The same email CC-ed to another client or to us will arrive fine.
If we forward that same email , it will arrive with the attached PDF.
We have tryid to use a mail-forwarder, the ISPs mail server, but still the same. the email arrives, no PDF .


the system was working properly

Answer : PDF attachments stripped from email - doesn't make sense

>a particular email  sent to Client A and CC-ed to my mailbox (different domain, different server, different location and IP) Client A receives the email without attachment and I will have it with attachment.

In the above statement, the person sending the email, is he/she on the same server as you are?
What version of Outlook client is Client A using?
Does the attachment appear when viewing from OWA?