---
schema_version: "1"
id: 60480ab6f53078644a8dc44b286f12495802156e0528c9350a78e8df7b7a2889
title: Dedupe Subscribers
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_co_deduplication_overview.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_co_deduplication_overview.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 9cde64a69648f2ac0fdeb7043002bd996615d5d544aa23e52b4b240f08c283b9
description: Deduplication prevents sending more than one email to the same email when using reports or campaigns through Marketing Cloud Connect for Marketing Cloud Engagement. To enable this feature when executing a send, select the Dedupe Subscriber flag.
products:
  - Marketing
  - Cross Cloud
release: "264"
---
# Dedupe Subscribers

Deduplication prevents sending more than one email to the same email when using reports or campaigns through Marketing Cloud Connect for Marketing Cloud Engagement. To enable this feature when executing a send, select the Dedupe Subscriber flag.

Consider the following about the Dedupe Subscribers setting:

- When sending to multiple reports, if the same contact appears in both reports, the contact receives only one email regardless of whether Dedupe subscribers is selected. For example, you’re sending an email to two reports, one containing all contacts in the Midwest and the other containing all contacts in Indianapolis. There is a contact in the Indianapolis report that also appears in the Midwest report. By default, this contact receives only one email.
- For a report or campaign that contains two contacts with the same email address and you don’t select Dedupe Subscribers, both contacts receive an email. For example, two family members both opt into your email list using the same email address. Two emails are sent to that email address.
- For a report or campaign that contains two contacts with same email address and you select Dedupe Subscribers, only the first contact receives the email. For example, a husband and wife both opted into your email list using the same email address. Only one email is sent to that email address.