![]() ![]() ![]() The next section outlines the troubleshooting process to determine the reason behind the actions taken by this filter. There will be scenarios where customers open support requests wanting to understand why the Greylist filter blocked or allowed specific messages against their expectations. Spammers send emails to randomly generated email addresses and while some email addresses may match real users, the majority of these messages are invalid and consequently floods the victim’s email server. Legitimate mail systems typically try to send the email after a few minutes spammers simply ignore such error messages. 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. Possible causes for this filter to malfunction: The filter. 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. Spam emails that come from unknown senders are not blocked by Greylist. ![]()
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