Thanks for bringing this up. This was a limitation we discovered a number of years ago now in vpopmail, but I checked it out, and it turns out the limitation has actually been resolved in the current version we distribute - so all we really need to do is change interworx to allow the higher quotas! We’ll make sure to include this in our next update, but if you’d like us to patch your server in the mean time feel free to open a ticket and reference this thread.