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In email marketing, Deltas refer to the changes in email lists. Because of the amount of time and bandwidth used to download mailing lists, subscriber lists, or opt-out lists, many Advertisers look for solutions allowing them to download “Deltas Only” OR “changes”, instead of downloading and scrubbing/cleasing the entire list every time a download is needed.

In regards to OPTIZMO

When the Advertiser creates a Campaign, and assigns a Mailer, the Advertiser has the choice of how the Mailer will upload and download the lists – Deltas Only is one of the options.