MPP Australia Email Security Blog » greylisting http://mpp.ezylink.net.au/blog MPP Australia News and Updates Wed, 03 Dec 2008 20:01:13 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Greylisting – how does it work? http://mpp.ezylink.net.au/blog/?p=5 http://mpp.ezylink.net.au/blog/?p=5#comments Tue, 20 Nov 2007 10:40:08 +0000 admin http://mpp.ezylink.net.au/blog/?p=5 Greylisting is a very effective, low-resource tool to stop spam and virus’. It works by sending an SMTP temporary failure message to any new sender on your network. Most spam drones and virus engines do not retry after temporary failure messages and simply go away, whilst legit mailservers will retry again after a period. Just be aware that new senders emails wont come through instantly – but once retried from the sending mail server and found OK their address is recorded and allowed as normal from then on.

Greylisting works with MPP and Postfix systems, and is integrated on a per group or system wide basis – and is another way that the MPP engine enables mail admins to reduce end user spam email even more.

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