outbound traffic security risk

["Hilal Hussein" <hilalma () hotmail com>]

Dear List,

I would like to ask about the risk of opening outbound port traffics in the 
firewall.

currently, i am opening the outbound ports traffic based on the user 
request, as pop3, and smtp traffics. I red about some risk that could be in 
some kind of outbound traffics which might pass java scripts, or trojan 
horses, or other kind of attacks during the opened session from users 
(inside the network) to the outbound.

so please, i need to know of any risk that could come with some kind of 
outbound traffics, and if there is a good link for resources about the 
latest news of vulnerabilities of such outbound traffics.

your respond is highly appreciated,

with regards,

Hilal

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