Actually, there would normally be very little (if any) extra overhead. The only extra overhead I could see would be if there were more than about 500 users on any given domain (as there would be over 500 files in one directory, which can cause a performance hit).... However, I wonder what the effective load would be on an IMail/Declude JunkMail server with a large customer base with all of the per-user files that would be required to make this work...?
-Scott
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