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Suppression Lists
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Cautionary Notes “NOTE: While Suppression Lists are very helpful, it is still important to keep your Marketing Lists clean.” NOTE: If you are using automated processes to trigger Email Sends containing Suppression Lists, ensure that you are never executing multiple Email Sends with the same Suppression List at the exact same time. This can cause an error with accessing the Suppression List and one or more of the Email Sends may fail. If this does occur for you, simply re-send the failed Email Sends individually.
In Data hygiene
What is a Suppression List? “They are not meant to act as a replacement or backup for the standard unsubscribe process.” You may select one or more static or dynamic Marketing Lists to exclude from your Email Send. For example, if you want to send an email to people who have not yet RSVP'd for an event you are hosting, you can use your original Marketing List of possible attendees as the one you will send to, and set other Marketing Lists of people who have already said they will attend and people who have already said they will not attend as your suppression lists for the Email Send. Anyone on the suppression list(s) will be excluded from being sent the email even if they are on the original Marketing List of possible attendees that was set for the Email Send if the email addresses match.