diff --git a/main.go b/main.go
index 143b63f..c2d6b2b 100644
--- a/main.go
+++ b/main.go
@@ -147,20 +147,6 @@ func handleConnection(clientConn net.Conn) {
 					smtp.client.Write([]byte("501 Syntax error in parameters or arguments\r\n"))
 					return
 				}
-
-				// email := strings.Trim(strings.TrimSpace(parts[1]), "<>")
-				// domain := strings.Split(email, "@")
-				// if len(domain) != 2 {
-				// 	smtp.client.Write([]byte("501 Syntax error in parameters or arguments\r\n"))
-				// 	return
-				// }
-				// fmt.Sscanf(parts[1], "<%s>%s", &email, &whatever)
-				// email := re.FindStringSubmatch(parts[1])
-				// if len(email) < 1 {
-				// 	log.Errorf("%s is not email address", email[1])
-				// 	return
-				// }
-				// domain := strings.Split(email[0], "@")
 				start := strings.Index(parts[1], "<")
 				end := strings.Index(parts[1], ">")
 				if start == -1 || end == -1 || start >= end {
@@ -187,7 +173,7 @@ func handleConnection(clientConn net.Conn) {
 				log.Warnf("Disconnecting %s - attempted DATA without valid recipient", smtp.clientAddr)
 				return
 			}
-			//Otherwise Forward to target and get response
+			// Otherwise Forward to target and get response
 			smtp.target.Write([]byte(line))
 			n, err := smtp.target.Read(response)
 			if err != nil {
@@ -215,7 +201,6 @@ func handleConnection(clientConn net.Conn) {
 				}
 			}()
 
-			// 从服务器到客户端
 			go func() {
 				defer wg.Done()
 				if _, err := io.Copy(smtp.client, smtp.target); err != nil {