如題：以下是內部錯誤訊息
[18376] 10/07/2019 16:09:00.629 <POP3> AUTH
[18376] 10/07/2019 16:09:00.629 <POP3> -ERR Command not valid in this state
[18376] 10/07/2019 16:09:00.630 <POP3> USER seajame
[18376] 10/07/2019 16:09:00.630 <POP3> +OK
[18376] 10/07/2019 16:09:00.631 <POP3> PASS ********
[18376] 10/07/2019 16:09:00.631 <POP3> +OK authentication successful
[18376] 10/07/2019 16:09:00.633 <POP3> STAT
[18376] 10/07/2019 16:09:00.634 <POP3> +OK 0 0
[18376] 10/07/2019 16:09:00.636 <POP3> UIDL
[18376] 10/07/2019 16:09:00.636 <POP3> +OK unique-id listing follows
外部退信訊息
This is the mail system at host m5.so-net.net.tw.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<seajame@lukejym.ddns.net>: host lukejym.ddns.net said: 551
Client was not authenticated (in reply to MAIL FROM command)
