I'm running Zimbra 8.0.2 and periodically receive alerts about a message not being delivered to an email address because the attachment contains a virus. The catch is the recipient is an invalid account.

Is there a way to configure it so that the very first check is to verify if a recipient is valid or not? This makes sense as if a recipient is invalid, there's no need to virus scan or pass the message through any spam checks...the message should simply be rejected/dropped.