I just wanted to get some info out there on how many domains SmarterMail can handle on a single server and what are good specs for a decent mail server. Here is what I had in mind. For the sake of performance vs price vs space I want to use SATA (SATA II of course) instead of SCSI. So, 1 78GB Western Digital Raptor for Windows, spool, declude, and AV filter. 2 mirror 500GB SATAII for the actual mail storage. Duel 3GHz Xeons 2GB's RAM (DDR2, ECC and registered) Would putting the swap file on the mirror array improve performance? I'd like to host somewhere around 4,000 domains on this server. I am not worried about CPU performance, more about disk IO. I know SCSI disks will be better but the price is astronimcal, like $600 for a 300GB drive, whereas it's $350 for a 500GB SATA right now. Pretty big difference. Plus SATA has a lot of the same features SCSI has. But even considering that is it worth it to sacrifice the disk space and go with a SCSI system instead? Disk IO is a concern because of the travel back and forth to the spool, declude, and AV processing. I will be using SmarterMail Enterprise Edition 3. Thansk for any suggestions. And if you have an example of a good setup please provide the specs, thanks!!