Add External Email Warning in message body

[Eric]

Hi All,

I'm trying to add something along the lines of "Warning: This email is 
from an external source. Please proceed with caution" etc etc, to the 
top of the body of any message from an external source. I've looked into 
doing this with the MTA (Exim in my case), and it doesn't seem possible. 
Is there a way to do this in MailScanner? Thanks for your help!


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