Spamassassin and attached spam?

hi all,
lot of customers claims that when they setup spamassassin the considerated spam e-mail will simple be attached to an e-mail and then send to ther mailbox So they recive all spam messages as an attache file..... What sens has this? Shouldn't they be delete? Is there anything i miss on how to config?

Thanks a lot

 

 

 

 

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