How do I suppress the people I mailed in a previous campaign, so that they're not in the Lookalike Model?

Usually, you can manage cross-campaign suppressions by adjusting the Minimum Days Between Mailings under Account Settings. However, with Lookalike sends, because your model can take 2-3 days to be built, it is hard to predict exactly how many days to adjust to. Instead, we recommend the following:

1. Visit the History Tab of the campaign whose recipients you wish to suppress.
2. Download a CSV of all recipients.
3. Upload the recipients as an Audience.
4. Select the audience for suppression for your Lookalike campaign.

Note: Members in the uploaded list will be suppressed from the send. If your list is too large for upload and needs to be downsized, reach out to support@heypoplar.com to ensure all members in your original list will be suppressed.