Stop zombies and hi-jacked home PC's from sending you unwanted mail! Greylists are the answer.
Greylisting is an emerging mail control standard which makes clever use of the SMTP mail protocol to thwart low tech mail sending programs. Such programs are often included in mail worms or in mass mailing software. As of build 900, nsj fully supports greylisting and offers you more complete protection against these annoying floods of unwanted mail.
Greylisting works by telling the host that tries to send your server a message that it cannot accept the message at the moment and that it should try again later. This re-try mechanism is part of the SMTP mail standard so should be fully supported on SMTP any standard mail server. The sending server just re-queues the message and sends it again later. The standard says that the time period should be no longer than 4 hours and in many cases it's simply a matter of a few minutes.
The next time the host connects to send the message (providing it's more than a few minutes later), the greylist allows it to pass through without any delay. The greylist also keeps track of the credentials and allows messages to the same person, from that sender & server to pass unhindered for 36 days thereafter.
Greylisting can introduce a small delay into the first message from a particular sender/server combination but after the first message, things run normally and without any delays. The less intelligent SMTP mail systems such as those in zombies, worms and mass mailers normally do not even attempt to re-deliver the message so your server doesn't get hit a second time.
Greylisting is highly effective at lowering your mail load because it operates at the very beginning of a mail conversation and has no need to look at the contents of a message. A 'greylist whitelist' can be configured to avoid greylisting certain domains or users or hosts that you feel shouldn't be subjected to a small delay.
To start using the nsj greylist feature you simply need to be using nsj build 900 or higher and add a single line to your nsj.ini file.
Full instructions can be found here
More information on greylisting can be found at
If you have any questions about greylisting or how it can be used at your site, please contact firstname.lastname@example.org
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