We are looking to set up some sort of redundancy on our email servers but are not sure how to proceed. We want at least 2 servers for email (pop3) and the mailboxes would need to be shared by both servers at the same time so that whichever one gets the email puts it into the mailbox. It seems as if a SAN is the only way to have truly redundant storage of any kind (besides DAS). Am I wrong? Is there a better way?