- System administrators would quickly lose control of the e-mail server and the ability to enforce the corporate e-mail policy.
- One person's e-mail may be another person's spam.
I suggest using a spam filter that not only blocks e-mails, but also quarantines them. This notifies users when they receive a suspicious e-mail, and allows them to preview the message and decide if it is a message they want. Tumbleweeds offers a hardware spam filter, called MailGate Appliance, that also quarantines. The E-mail Protection Agency also offers a managed spam service. It automatically quarantines e-mails classified as spam...
and keeps them on the system for 28 days. During this period, administrators can log in to the online portal where the spam e-mails are stored, preview and release them if needed. While it does not completely eliminate this task from the network administrator's workload, the quarantine approach is less onerous than trying to continually adjust your spam filters, and it avoids the risk of exposing the network to malicious code sent from untrusted sources.
Dig deeper on Email Security Guidelines, Encryption and Appliances
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