[[TranslatedPages]] = Why does it take 30 minutes for some messages to get delivered? = May First/People Link uses a technique called [WikiPedia:Greylisting greylisting] to help reduce the amount of spam being sent to our servers. Greylisting means that the first time an email message is sent to our server, our server defers delivery - telling the sending mail server: "Try again later." The next time the sending server tries to send the message, our server accepts it. Once an email sender/recipient combination has been greylisted once, it will not be greylisted again. So - this step will only happen the first time a sender sends you a message. == Why is this useful? == Legitimate email servers [RFC:2821#section-4.5.4.1 will resend their message in around 30 minutes]. Most spammers do not run legitimate email servers, and so never retry their spam messages. This greatly reduces the amount of spam that MF/PL's mail servers need to handle, and means that we can devote a greater proportion of our resources to handling your legitimate mail.