Frequently Asked Questions - What is SilverListing?

SilverListing

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What is SilverListing?

The Sendio ESP SilverListing service is an enhanced implementation of an anti-spam technique commonly known as “greylisting.” The basic concept is that most spam-sending systems are optimized for maximum output only. With the SilverList service of the Sendio ESP enabled, when a message is received from an IP address the Sendio ESP has never heard from before this first message is deferred. Per the SMTP protocol, after a short period of time a legitimate e-mail server will decide that the initial request has been lost somewhere in transit across the Internet, and will resend the request-to-send message. In contrast, most spam-sending systems will not resend the request and will simply move on to send the next spam message somewhere else. Once the sending e-mail server retries the IP address will be added and not checked again for 30 days.

To enable SilverListing navigate to Web Interface > System > Options tab. For some older systems set SilverListing to "Enabled" under the Web Interface > System > Inbound Control Tab.

With Sendio 6 the SilverListing Spoof Protection option was added. With this option set to Enabled messages from Accept Contacts will be subjected to the SilverListing test only if the message arrives from an IP address which has not previously passed the SilverListing test.

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5519/24%Last update: 2010-08-17 16:16
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What is SilverListing?