Failed message help

[--[ UxBoD ]--]

Hi, 

One of our clients is trying to relay a message through a MailScanner instance and it is constantly failing with: 

Oct 16 17:49:20 eur-mailscanner-01 MailScanner[26246]: Making attempt 3 at processing message 265153580211.AF8CA 

I have checked the quarantine message and it is a Outlook email containing a Powerpoint attachment. How can one diagnose the issue please as I cannot see anything wrong with the email. This is using the latest release of MailScanner. 
-- 
Thanks, Phil 

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