[exim] rejected mails

Hello,

I'm looking for something which is usefull for ma society.
When someone send a mail to user@??? with an attachment, I
want this mail going to a quarantine folder. I want to be able to tell
to myusers that even this mail seems incorrect, I can give him the
attachemnt.

Where can I add this "function" ?

Is it an save option in my system filter ?

Thank you

--
Franck Huet
Administrateur Unix/Linux
Boursorama
Tel : 01-46-09-48-17