I found a bug: The message you can specify in /etc/conf.d/postgrey: POSTGREY_TEXT="Greylisted for %s seconds" is not displayed correctly in Postfix: 450 4.7.1 <asd@test.com>: Sender address rejected: "Greylisted I changed it to POSTGREY_TEXT="Greylisted" and then it said: 450 4.7.1 <asd@test.com>: Sender address rejected: "Greylisted" I also tried with versions 1.27 afterwards, same result. Propably something with the escaping is wrong, but as it's a cosmetic error, I didn't search for it.
*** This bug has been marked as a duplicate of bug 119109 ***