>Actually, we find that some of our customers update their virus definitions
>as often as every 4 hours (but then again, we also have a few customers
>using 3 or more virus scanners!). However, the optimal frequency of
>updating depends a lot on your normal volume of viruses (the more you
>receive compared to other mailservers, the more frequently you should update).
Well, you can only update as often as the AV company releases a new sigfile, right?
True. But a decent AV company will come out with new virus definitions as soon as they are ready, not on a set schedule. While they may have a set schedule for regular updates (that include viruses that are not in the wild, but they have samples of), they should also have updates as soon as new viruses appear in the wild.
When our customers check for updates every 4 hours, perhaps 90% of the time they aren't getting new virus definitions. But if a new virus comes out, they don't end up waiting as long as 24 hours to get the new virus definitions. For most people, checking every 24 hours is acceptable (especially if their mailserver admin is on one of the mailing lists that most AV companies have that announce new viruses, and a manual update is done when a new virus starts spreading fast).
-Scott
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