From bfdf324ca6043be03a948eb17b9e691769c06648 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Sat, 4 Jan 2025 20:45:09 +0800
Subject: Implement NOOP

---
 mta_recv.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mta_recv.go b/mta_recv.go
index c77c46d..1d2c4f3 100644
--- a/mta_recv.go
+++ b/mta_recv.go
@@ -141,6 +141,9 @@ func handle_incoming_server_connection(reader *bufio.Reader, writer *bufio.Write
 			_, _ = writer.WriteString("221 2.0.0 Bye\r\n")
 			_ = writer.Flush()
 			return nil
+		case "NOOP":
+			_, _ = writer.WriteString("250 2.0.0 Ok\r\n")
+			_ = writer.Flush()
 		case "RSET":
 			if server_state != server_state_begin {
 				server_state = server_state_helo
-- 
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