# About the Email Suppression List Emails sent from Vault may fail to deliver for several reasons. If an email produces a [hard bounce][1] 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_. In addition, a record is created on the _Suppression Email Address_ raw object. ## 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. Searching is case-sensitive, and wildcard searches are not supported since the _Email Suppression List_ uses the _Suppressed Email Address_ raw object. For example, if you search "gmail.com", the results will not return email addresses that end in "gmail.com". 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 {#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. | [1]: #bounces