If you have limited technical resources you can outsource you email spam filtering to a hosted anti spam and virus solution provider. Spam filter service providers colocate their spam and virus filters in data centers with redundant power and network connections.
You will need to change your mail exchanger on your dns servers to point to the service providers spam filters. Your service provider will then scrub your email for spam and viruses. They then forward your email to your mail server minus the spam and viruses.
This gives you a few extra layers of protection. In the event of a network outage or server downtime your email is held and is delivered when the network or your server is available minus the virus and spam. |