ตัวอย่างหนังสือ

The following From address failed: opsvlcloud@gmail.com : MAIL FROM command failed,5.7.57 Client not authenticated to send mail. [KU3P306CA0002.MYSP306.PROD.OUTLOOK.COM 2026-05-20T08:03:25.673Z 08DEB622926F4553],530,SMTP server error: MAIL FROM command failed Detail: 5.7.57 Client not authenticated to send mail. [KU3P306CA0002.MYSP306.PROD.OUTLOOK.COM 2026-05-20T08:03:25.673Z 08DEB622926F4553] SMTP code: 530
2026-05-20 08:03:28 CLIENT -> SERVER: QUIT
2026-05-20 08:03:28 SERVER -> CLIENT:
2026-05-20 08:03:28 SMTP ERROR: QUIT command failed: