Definition of "greylisting" [greylisting]

• Present participle of greylist. (verb)

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• "Vodacom, however, said that in Europe blacklisting had not worked and "greylisting" was a better option."
• "For example, greylisting institutes a delay period for unknown senders and causes spam blasts to miss their targets."
• "My results with Spamassassin have been mixed, but if your ISP will employ greylisting, that will dramatically reduce the amount of spam one receives."