Wanted to make a new post but didn't work, so why not post it here:

we've encountered that the standard setting in the OVA, to append the
"X-Assp-Intended-For"-Header both to incoming and outgoing mails, is HUGELY
insecure and also might violate privacy rules in Europe in some setups
regarding BCC: 

If you have an Exchange Server before you relay through ASSP, the Exchange
Server will split the mail into one mail to the original recipient and one
mail to the BCC'd recipients. But it will (of course) remove the BCC header
line from both mails. 
So what this means is ASSP now does not know anymore that some of these
addresses have been BCC addresses, other than looking if they appear
somewhere in the header lines (To or CC).
ASSP currently only doesn't add the intended-for header lines if there is a
corresponding BCC entry, if I'm correct.

So in the end, if you do not strip the X-Assp-Intended-For header lines
after ASSP, the BCC'd users will see each other. 



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