Question: I've been using MongoDB on CentOS with ext4 for a few months now with no problems. I'm potentially going to be moving to Joyentcloud, and their SmartOS is based off of OpenSolaris and uses ZFS. I'm wondering if there could be some downsides to switching to this for MongoDB?

Answer: 
If you want all mails redirected to Gmail, then you can accept it there instead. Without redirecting. All mails are handled at Google directly. This is called [Google Apps](http://www.google.com/apps/intl/en/business/index.html) and is free for no charge for a limited amount of users. And as I understood you only have one per domain.
MailEnable is a lightwieght and free Windows mail server, dead easy too

Google for it, you can set it up as easy or as complex as you like

Good luck