3 ms·
See also the "Disadvantages" section at <https://en.wikipedia.org/wiki/Greylisting> https://en.wikipedia.org/wiki/Greylisting>, and read section 4 of RFC6647 at
by bradknowles 8y ago
See also the "Disadvantages" section at <https://en.wikipedia.org/wiki/Greylisting> https://en.wikipedia.org/wiki/Greylisting>, and read section 4 of RFC6647 at <https://tools.ietf.org/html/rfc6647#section-4> https://tools.ietf.org/html/rfc6647#section-4>. Note that his RFC was written in 2012.