問題
為何我會收到由 HENNGE Email DLP 服務寄出來的 Non Delivery Receipt（未寄成功通知）報告？
答案
HENNGE Email DLP 服務會解析並過濾整封電子郵件，包含附件裡面的內容。
如果信件在解析並過濾時發生了狀況並無法如計畫完成時，該封電子郵件可能會無法寄送給收件者，寄件者並會收到無法寄送完成「Non Delivery Receipt(NDR) 」的通知。
如果信件在解析並過濾時發生了狀況並無法如計畫完成時，該封電子郵件可能會無法寄送給收件者，寄件者並會收到無法寄送完成「Non Delivery Receipt(NDR) 」的通知。
- NDR Sender
From: HENNGE One Mail Delivery System <MAILER-DAEMON@bounce.mo.hdems.com>
- NDR Example
This is HENNGE One mail system.
I'm sorry to inform you that your message could not be delivered to a recipient. It's attached below.
For further assistance, please contact our support.
If you do so, please include this problem report. You can delete your own text from the attached return message.
The mail system
<Undeliverable Recipient address>: <Error Reason(*)>
(*) 請參考以下的錯誤訊息。
| Error Message | Details |
| maximum uncompressed data size exceeded | If the attachments are compressed, the decompressed files may be too large. Please use a file transfer service, such as HENNGE Secure Transfer, or manually compress the files into a password-protected file before sending the email again. Depending on the Email DLP policy set for your organization, password-protected files or compressed files may be restricted. To find out more about your organization policy, please contact your system administrator. |
| Bad recipient address syntax | One or more recipient email addresses are invalid. Check the addresses and send the email again. |
| System error | If one or more files are attached, please use a file transfer service such as HENNGE Secure Transfer, or manually compress the files into a password-protected file. Please contact your system administrator if the issue is not resolved with this method. For system administrators, please send a message source of the sender(eml file) to Customer Success Guide for further investigation. Reference：How to obtain a message source? |
| secure_transfer: too many attachments | The maximum number of files that can be attached in HENNGE Secure Download is 20. Please reduce the number of attachments to 20 or less and resend the email. |
| secure_transfer: invalid recipient address | Recipient email address is invalid. Check the recipient email address and send the email again. |
| secure_transfer: transfer disabled | Before delivering the email, the sender disables the download link. Please check the attachments and send the email again. |
| secure_transfer: sender's account information is invalid | Sender's account information is invalid. Please recreate that account in HENNGE Email DLP and send the email again. |
| secure_transfer: the integration has been disabled | HENNGE Secure Download function is enabled in a rule in HENNGE Email DLP where HENNGE Secure Download service is not contracted. Please disable HENNGE Secure Download function. |
| secure_transfer: transfer not found | HENNGE Email DLP was unable to find the transfer as it has been deleted. |
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