> > Wouldn't it be better in the case of spam and virus filtering
> to defer the
> > message delivery rather than allow it through without acting on it?
>
> For some, maybe, for me, no, and for someone just starting to learn this
> entire mish-mash of stuff, no.  It also depends on your client base.  Do
> they mind losing all of their mail for hours if something goes wrong?
>
I have multiple front-end servers just so that a single failure won't affect
mail as a whole.  I have network management in place to make sure all
services are available and to page me if their not.  All of this has been
done with open-source software on reasonably inexpensive systems.  It's
definitely a trade-off question: do you prefer to let mail slip without
filtering, or do you prefer to run the risk of having all deliveries
deferred due to a fault.  Considering that a fault would likely be a major
event anyway, I've chosen to err on the side of caution in terms of
protecting my customers' inboxes.


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