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Backed Up Mail - Unconverted Mail Guide

※ Last updated: 2025-09-08

SHIELD Mail'sUnconverted MailThe menu is a screen where you can check and manage emails that could not be converted properly due to errors during email security conversion. These emails are stored for a maximum of 2 months and will be automatically deleted thereafter.

1. What is an unconverted email?​

**What is an unconverted email?**It refers to emails that were not converted properly due to an error during the mail security conversion.

  1. If SHIELD Mail fails to convert the original email to a secure email
  2. Main causes of failure: attachment issues, authentication/authorization errors, etc.

2. Menu Entry​

Backed Up Mail > Unconverted MailYou can access the unconverted mail management screen from the menu.

unconverted-mail

  • You can select a period (7 days, 30 days, 45 days, 60 days) and a custom period at the top of the screen.
  • SIDYou can search for specific emails by entering keywords for the sender/recipient.

3. Screen Composition​

3-1. List Table Items​

ColumnDescription
dateDate and time the email was received
Unconverted attachmentNumber of failed attachments during conversion
TypeError Types
SenderSender's email address
RecipientRecipient's email address
TitleEmail Subject
SIDUnique identifier assigned by the system (Session ID)

3-2. Detailed View​

When you click an item in the list, detailed information is displayed in the right panel.

unconverted-detail

  • Unconverted Information Tab

    • date
    • Conversion Error Types
    • File Name
    • Error Codes and Detailed Messages
    • Related Policy Name

  • Details Tab

    • Sender / Receiver
    • SID
    • Title
    • Conversion results by attachment file (Success/Failure indication)

3-3. Unconverted Error Types​

The types of errors that can be confirmed in unconverted emails are as follows:

① Policy-related errors

  • Policy request failed
  • Policy Evaluation Failure
  • Policy not found

② File conversion related errors

  • File conversion failed
  • File decryption failed
  • File encryption failed

③ File System Related Errors

  • File not found
  • File Read Error
  • File Write Error
  • No file access permission
  • File already exists

④ Authentication/Authorization Related Errors

  • Authentication failed
  • Permission Denied
  • Invalid SHIELD ID
  • Token Expiration

⑤ Errors related to API calls

  • API call failed
  • Container Service Error
  • ZTCA Connection Error
  • Key storage error
  • Label API Error

⑥ System-related Errors

  • System Error
  • Invalid parameter
  • Incorrect system status
  • Timeout

7. Others

  • Unknown error

Scheduled for update.