We've run our own mail servers for a number of years and during that period, the battle against SPAM email hasn't really stopped. Amonst the plethora of defences already implemented, we have been watching the progress of 'SPF' has been making. With the number of domains now using SPF increasing,  what follows is a description of how we have implemeneted it on Solaris with Postfix.

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As we are in the process of revising our co-location servers for 2010, one of the challenges that has come up is how to provide a 'communications' component that delivers:

• Small form factor (must fit in a 1u chassis)
• Minimum of 9 100Tx ethernet ports
• VLAN tagging (802.1q) available on at least 4 ports
• Remote access through IPSEC
• Either dual PSU or two physical units
• Low cost!

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