| July 8, 2003
Email is critical to users of the Internet.
Hardware failure, spam and today's email volume all put strains upon the
proper functioning of an email-handling system. In response, Green Apple has
completed the deployment of a multi-tier email architecture, providing users
higher performance, security and robustness in our email system.
The first tier receives emails from the
Internet and performs spam filtering and light virus filtering. The second
tier processes outbound email, providing light virus-filtering. The third tier
resides behind a firewall and is used to securely store user mailboxes. Each
tier is made up of machines and software to provide transparent fall-over in
the event of overload or failure -- imagine having a car that had not only a
spare tire but the capability to change a flat.
Besides providing a high degree of
fault-tolerance, the architecture allows for additional units to be installed
at a tier, giving it a high-level of scalability.
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