unwhitelisted

One problem with that configuration is what to do about any wanted but unknown and unwhitelisted mail, which will be in that Junk filter buried in the spam which wouldn't be any fun to dig thru' to find.

2005 December 22, Mike Easter, “Scam emails”, in 24hoursupport.helpdesk (Usenet)

The crutch of the matter is, Postfix is not *bouncing* this mail, it's giving a 4xx (temporary) rejection and inviting the client to try again later (which is what a greylist policy daemon would do anyway with a new, unwhitelisted triplet).

2007 January 3, Tony Earnshaw, “How to make greylisting and check_policy_server more robust?”, in list.postfix.users (Usenet)

Note that my private addresses are unwhitelisted and yet have essentially zero spam.

2007 March 5, Oz, “Hello from the sunny climate of North Yorkshire - Joke”, in uk.business.agriculture (Usenet)

The first time that an email from an unwhitelisted source has an unrecognized triplet the email is rejected and the triplet is added to the grey list.

2008 March, Harry Newton, Newton’s Telecom Dictionary, 24th edition, New York, N.Y.: Flatiron Publishing, →ISBN, page 440

I suggested compelling same-old-same-old helmet articles to carry the string "helmet thread" or suchlike in the Subject line, and when unwhitelisted people initiate such threads without such a string, explain the requirement along with an indication that it's a bit of a bleeding ulcer and here are the stock arguments.

2009 June 9, David Damerell, “Re: RFD: create moderated newsgroup uk.rec.cycling.moderated”, in uk.rec.cycling (Usenet)