diff --git a/filters/postfix.preg b/filters/postfix.preg
index 8295ba8..d1adfb2 100644
--- a/filters/postfix.preg
+++ b/filters/postfix.preg
@@ -2,3 +2,4 @@ NOQUEUE: reject: RCPT from [[:print:]]+\[<HOST>\]: 450 4\.7\.1 Client host rejec
 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
+lost connection after AUTH from [[:print:]]+\[<HOST>\]