Message deleted without being read

I am recieving reports from people who have sent e-mail into an organisation and they get a response that says the message was deleted without beig read.  I have checked and it is caused by the Spam filter.  The Spam filter detects the spam message and forwards the mail to a dedicated Spma mailbox.  The original recipient does not get the message and does not deleted it.  Is there a way of disabling this automated message in Exchange or even better, is ther a way of changing the Exchnage message that gets sent back to the user saying that it was detected as spam and moved.

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I am not aware of a way to change this behaviour. It is down to read receipts and their functionality. The spam filter is obviously doing something with the message that is causing the mail engine to process the read receipt.

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