From d93fe3b763da66c37cb6464a593011f049555ef2 Mon Sep 17 00:00:00 2001
From: linyows <linyows@gmail.com>
Date: Mon, 20 May 2024 15:59:10 +0900
Subject: [PATCH] lowercase letters are allowed

---
 pipe.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pipe.go b/pipe.go
index 02aaa30..d4b49bd 100644
--- a/pipe.go
+++ b/pipe.go
@@ -46,8 +46,8 @@ type Direction string
 type Elapse int
 
 const (
-	mailFromPrefix string = "MAIL FROM:<"
-	rcptToPrefix   string = "RCPT TO:<"
+	mailFromPrefix string = "(?i)MAIL FROM:<"
+	rcptToPrefix   string = "(?i)RCPT TO:<"
 	mailRegex      string = `[A-z0-9.!#$%&'*+\-/=?^_\{|}~]{1,64}@[A-z0-9.\-]{1,255}`
 	crlf           string = "\r\n"
 	mailHeaderEnd  string = crlf + crlf