diff --git a/docs/filters/postfix.preg b/docs/filters/postfix.preg
index 8caa378..8295ba8 100644
--- a/docs/filters/postfix.preg
+++ b/docs/filters/postfix.preg
@@ -1,3 +1,4 @@
+NOQUEUE: reject: RCPT from [[:print:]]+\[<HOST>\]: 450 4\.7\.1 Client host rejected
 NOQUEUE: reject: RCPT from [[:print:]]+\[<HOST>\]: 454 4\.7\.1 Service unavailable; Client host \[[[:print:]]+\] blocked
 NOQUEUE: reject: RCPT from [[:print:]]+\[<HOST>\]: 554 5\.7\.1 .*
 warning: [[:print:]]+\[<HOST>\]: SASL [A-Z0-9-]+ authentication failed