Send block list

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Available in Classic and VPC

When a hard bounce result is received during email delivery, the system registers the recipient email address in the send block list.

  • Addresses registered in the list are retained for 7 days (168 hours) by default, and the hold time can be changed.
  • If you change the send block hold time, the change applies only to addresses registered afterward and does not affect addresses already registered.
Note

A hard bounce is a delivery result code indicating a permanent failure that prevents email delivery, and resend attempts continue to fail. Example: Send an email to a non-existent address.

The following delivery result codes are classified as hard bounces:

Code Description
MAILBOX_ERROR Sending failed due to recipient mailbox error.
MAIL_CONTENTS_ERROR Sending failed due to mail content error.
NETWORK_ERROR Sending failed due to network error.
RECEIVE_MAIL_SERVICE_ERROR Sending failed due to recipient mail service error.
RECIPIENT_ADDRESS_ERROR Sending failed due to recipient address error.
SECURITY_AND_POLICY_ERROR Sending failed due to security and policy error.
SMTP_ERROR Sending failed due to SMTP error on the recipient side.

If you attempt to send an email to an address registered in the send block list, the email delivery is blocked with the result code SEND_BLOCK_ADDRESS.

Send block list interface

To access the Send block list menu, in the NAVER Cloud Platform console, navigate to i_menu > Services > Application Services > Cloud Outbound Mailer > Send block list.
The Send block list interface includes the following components:

cloudoutboundmailer-use-sendblock_screen_ko

Component Description
① Menu name Current menu name.
② Basic features Features displayed when you first access the Send block list menu.
  • [Learn more]: Go to the Cloud Outbound Mailer overview page.
  • [Refresh]: Reload the current page.
③ Search bar Search by entering an email address. To cancel the search, click [Reset].
  • If the searched address exists in the send block history, the list is displayed at the bottom of the page.
  • If the searched address does not exist in the send block history, a No data message is displayed.
④ Configure default send block hold time Change the period during which send blocks are retained by the system (see Change send block hold time).

View the send block list

The Send block list is displayed only when a send block history is found by searching for an address.
To view the Send block list by searching for an address:

  1. In the NAVER Cloud Platform console, navigate to i_menu > Services > Application Services > Cloud Outbound Mailer.
  2. Click the Send block list menu.
  3. Enter an email address in the search bar to search.
    cloudoutboundmailer-use-sendblock_search_ko
  4. Review the send block status and history for the searched address.
    • If the searched address is blocked, you can view the registration history and the scheduled removal time.
      cloudoutboundmailer-use-sendblock_search_result_1_ko
      • Click [View] in the delivery result message to see the delivery result message recorded in the system.
      • Click [Remove from send block list] to immediately remove the send block.
    • If the searched address is not blocked, you can view the registration and removal history.
      cloudoutboundmailer-use-sendblock_search_result_2_ko
      • Click [View] in the delivery result message to see the delivery result message recorded in the system.

Change send block hold time

To change the default period for retaining send blocks in the system:

  1. In the NAVER Cloud Platform console, navigate to i_menu > Services > Application Services > Cloud Outbound Mailer.
  2. Click the Send block list menu.
  3. Click [Configure default send block hold time].
  4. When the settings popup appears, edit the time as needed.
    • You can set the time unit to days or hours.
    • You can set the period to 7 days (168 hours) or longer.
  5. Click [Yes].
  6. In the completion popup, click [OK].