The MailMarshal 6.1 SMTP Server does not unpack and analyze the content of ACE archives, making it possible to circumvent any active content filter by default.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/47225/mailmarshal61.txt
Source: https://packetstormsecurity.com/files/47225/mailmarshal61.txt.html