The A-List enables mail box providers to block spoofed mail for domains signing with DKIM without calling to DNS for every email received.

The A-List application is a free Sendmail plug-in (milter) that works with the Sendmail DKIM milter to identify unsigned emails from domains that the sender has indicated should be signed. This is the low-hanging fruit for blocking fraudulent email. Without the A-List milter, DKIM requires a DNS call for every email received.

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Relevant Links

How the A-List works
Sender Registration
A-List Support
A-List Installation

Other Downloads
Firefox Add-on
Thunderbird Add-on