In its current form virtuald would not be able to chroot to different spool directories for each domain. Therefore, mail would only be able to respond as one IP and there would no longer be a unique spool directory for each domain. All the web sharing IP clients would have to share that IPs spool directory. That would mean duplicate usernames would be an issue again. However, that is the price you pay for sharing IPs.
Most web servers use a similar interface.
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