Originally Posted by gachnar
Jan 7 13:46:17 spamsnake postfix/smtpd: NOQUEUE: reject: RCPT from: 450 4.7.1 <email@example.com>: : Recipient address rejected: Greylisted by greyfix 0.3.9, try again in 60 seconds.
This is what greylisting is all about, the message is rejected with a 4xx code which means try again later. any smtp client that is not ratware should try again.
Actual bounces use the 5xx codes.