Email is bane or boom….obviously a great invention (if I term it that way) for the mankind and a great great headache for email administrators. More than we the users are inconvenienced by email spam or malicious attack, it's them who have to make sure that the system (sometimes million dollar worth) remains clean and well guarded. Security vendor Postini shows via statistics that spam traffic actually grew by 147% last year and astoundingly viruses were found in every 200 odd mails.
Big companies will deploy a team for specific purposes no matter what the scale is but small and medium enterprises that don't have enough resources to handle situation like this opt for outsourcing of email security.
Since it does not require stuff like onsite equipment or external access to private servers and networks, email security is normally regarded as one of the most easily implemented outsourcing services.
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