Emails sent from Vault may fail to deliver for several reasons. If an email produces a hard bounce and fails to deliver permanently, Vault adds the email address to the Email Suppression List and will not attempt to send further emails to that address.
After Vault adds the email address to the suppression list, the Email Notification Status page updates the status of any emails that should be sent to this address to Blocked.
Managing the Email Suppression List
You can navigate to Admin > Operations > Email Suppression List to view the suppression list. The Email Suppression List page tracks suppressed email addresses, the reason for the suppression, and the suppression date.
You can also search for suppressed email addresses, names, and suppression reasons. To sort the columns, click the headings.
To remove an email address from the list, click the Actions menu next to the address and select Remove from Suppression List. You cannot manually add email addresses to the suppression list.
Note: If an email sent to an address that you removed encounters a hard bounce, the address is added back to the suppression list; this process will continue until the cause of the bounce is resolved.
Disabling the Email Suppression List
To disable the email suppression list, navigate to Admin > Configuration > Email Settings and clear the Enable Email Suppression List checkbox.
Note: We strongly advise against disabling the Email Suppression List. The sender reputation of an organization’s email domain partially depends on the number of bounced emails. Email domains with low reputations are more likely to be marked as spam. Disabling the suppression list increases the likelihood that Vault emails will be marked as spam or bounced by receiving email servers, resulting in more Failed emails.
Hard Bounces
A hard bounce usually indicates a permanent error, but can also be caused by a strict email security filter from the receiving mail server. The Suppression Reason column usually contains an error code and some information on why an email address was added to the suppression list. These error codes are standard SMTP error codes provided by the receiving mail server and are not generated by Vault.
You can refer to these pages for more details on these SMTP error codes:
- Microsoft Learn: Email non-delivery reports and SMTP errors in Exchange Online
- Google Workspace Admin Help: About SMTP error messages
- Google Workspace Admin Help: Gmail SMTP errors and codes
- Wikipedia: List of SMTP server return codes.
Related Permissions
You can manage the suppression list with the standard System Admin or Vault Owner security profile. If your Vault uses custom security profiles, your profile must grant the following permissions:
| Type | Permission Label | Controls |
|---|---|---|
| Security Profile | Objects: Suppressed Email Address: Read | Ability to view the Email Suppression list. |
| Security Profile | Admin: Operations: Email Notifications: Read | Ability to view the Email Notification Status and Email Suppression List pages. |
| Security Profile | Admin: Operations: Email Notifications: Delete | Ability to delete a record from the Email Suppression list. |