Hi I'm working on a mail system design for an ISP that includes hosting of multiple virtual domains managed by this ISP (300.000 mailbox). HA and performance are both important concerns for the client, so I have at least 2 of every server (webmail, pop3, imap, relay and smtp (postfix)) for which i'm using either L4 or MX record load balancing/HA. I hate the idea of distributing mailboxes among servers and I'm trying to go for a single mailstore that is accessible by POP3/IMAP servers and delivery SMTP servers and I'm planning to use a SAN for this. The basic idea is to share the mailstore between SMTP servers (clustered storage using GFS maybe) and make the same mailstore available to POP/IMAP server using NFS. Am I on the right track here?
Jaques
