100% uptime for a web application
I wish to create my own personal email server. I can't have any downtime - so I have 3 machines at different IP adresses around the city setup for redundancy.
My goals are:
- Dynamic IP's using dyndns for security and ease of setup. (already done)
- Redundacy so all servers are in sync at all times (when online)
- Security of some sort
- Advanced mail settings (imap or better) - so that I can have multiple devices of all types sync email read/unread/deletion etc.
- Instant mail receiving (as soon as a message is received on the server - it instantly is received on all devices as well.
If anyone here can point me in the right direction that would be great.