Select a license key from the Available keys list. The next section outlines the troubleshooting process to determine the reason behind the actions taken by this filter. When upgrading GFI MailEssentials to a build of the same version, such as when installing a Service Release, you have two options to enter a license. There will be scenarios where customers open support requests wanting to understand why the Greylist filter blocked or allowed specific messages against their expectations. Legitimate mail systems typically try to send the email after a few minutes spammers simply ignore such error messages. In GFI MailEssentials, some anti-spam filters can be configured to execute when the full email is received or at SMTP Transmission level.In SMTP Transmission filtering, emails are scanned whilst they are being received. The Greylist Anti-Spam filter works by temporarily blocking incoming emails received from unknown senders. In this article, you will learn how to determine why the Greylist filter blocked or allowed a message as part of the troubleshooting process involving this Anti-Spam plug-in. Greylisting is a simple but very effective anti-spam mechanism that works at SMTP level and based on the premise that spammers continuously send emails without checking for error messages. The Greylist Anti-Spam filter is designed to block spam originating from spammers and bulk mailers that do not resend emails on delivery failure.
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