> Some people refer to "greylisting" as in "E-mail that is blatant spam > gets blacklisted (it is deleted), E-mail that is obviously legitimate > gets whitelisted (delivered), and all other E-mail is marked with > 'possible spam:' in the subject". Some people refer to "greylist" as a > list of organizations that have non-double-opt-in mailing lists. > Others refer to "greylist" as a list of legitimate organizations that > send E-mail to people that requested it, but many of whom no longer > want the E-mail and classify it as spam, without requesting removal.
But the OP specifically mentioned "all people writing mail servers" and other than the first one above have little to do with an MTA.
I'm sure he meant "all people writing anti-spam programs", as MTAs themselves won't do any of the above (unless they have anti-spam built in).
BTW, searching Google yields http://projects.puremagic.com/greylisting/ which is the functionality I assumed the OP was asking about.
Yes, it does -- but that's the bozo that tried marketing his product named "greylisting" and using the term to meet his needs, after it was already very obvious that the term "greylisting" meant many things to many people. He's either someone who isn't familiar with the anti-spam industry, or is trying to manipulate people's understanding of spam. His version of greylisting is one of the list intuitive ones.
-Scott
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