A Suppression List is a text file of email addresses which can be used to clean a List before deploying a campaign.  The Suppression feature is useful to temporarily prevent sending to specific subscribers.  If you need to prevent sending to the same subscribers for multiple campaigns, you may wish to use Segmentation Rules or opt out the subscribers. 

Accessing Suppression Lists

Suppression Lists are accessed from the Lists menu.  To access the Suppression Lists, go to LISTS > SUPPRESSION > VIEW SUPPRESSION LISTS.  This will open the Suppression Lists page.

The Suppression Lists page displays a list of all existing Suppression Lists, allowing you to create a new Suppression List or update an existing Suppression List.

The details displayed for each Suppression List include:


The name of the Suppression List. 


A short description of the list or its purpose.


The size of the .txt file.


If the file is shared with child realms, a check icon will appear.


If the file is MD5 encrypted, a check icon will appear.


Click the gear icon to Suppress subscribers manually.


Required File Format

The Suppression List File must be a text (.txt) file.  Other file types are not supported. 

Email Addresses must be separated by carriage returns (new line).   Special characters such as colons and semi-colons are not supported in the text file.   The only special characters you should use are those supported by email addresses, such as ampersand, period, underscore, and plus.

The Suppression List File should include only Email Addresses of the subscribers to suppress. 

Subscriber by Email Address

An email address must use the following format:

For example, suppresses all subscribers with the exact email address in the campaign. 

Subscribers by Email Domain

To suppress all subscribers from a specific domain, use a wildcard instead of the specific username:


For example, * suppresses all subscribers with any email address that ends with the Hotmail domain including,, and

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