This thread should quite possibly be moved to a more appropriate area for better assistance. Especially since you are discussing Malware/Exploits. However I am uncertain as to what area would be most beneficial?
Moved to Malware Discussion > Corporate User Assistance.
Please read here: McAfee Labs Security Advisory: MTIS15-030
Or download this PDF on the subject: https://community.mcafee.com/servlet/JiveServlet/downloadBody/6877-102-2-16402/M TIS15-030.pdf
As you posted in 2 areas about the same thing and your profile says nothing about McAfee products, if you need product guidelines please indicate what product you are using and then I can move it there if you wish.
Sorry, I've posted in "Web Gateway" and "Email Gatway", and asked for best practice advises for this two different technologies.
I know this document MTIS15-030, but this does not answer my questions..
Moved this back to Email Gateway then, hopefully someone will answer soon, sorry for the inconvenience.
I'll reopen the other thread too.