As every enterprise has some form of messaging security in place, the decision to consider a new gateway is generally prompted by problems with an existing system.
Obviously, the key tip for buying is to make sure your new gateway is at least as good as your old one. This means identifying
what you like -- and don't like -- about your existing gateway and using that information to guide your evaluation criteria
for the new gateway.
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Moving on from what you have to where you are going, you'll also want to evaluate five feature areas: antispam, antivirus, user controls, system architecture and additional security.
Antispam features
The biggest differentiator between products is the quality of the antispam engine when it's applied to your mail flow. To
determine that, you'll need to test any potential gateway in your own environment. Once you've found an engine that meets
your goals for catch and false-positive rates, you'll want to consider at least the following as ways of differentiating products
and identifying ones that meet your needs best:
* Does the antispam engine offer multiple verdict levels that you can use to help reduce undetected false positives?
* Does the messaging-security gateway have reputation-based filtering that allows you to refuse a message at SMTP time to reduce total system load?
* Can the messaging-security gateway integrate easily with your existing e-mail directory infrastructure?
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