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Explanation

The Email Dropped event is an internal MoEngage event recorded only for event-triggered and flow email campaigns. During delivery, MoEngage drops a send and generates this event when:
  1. The user’s unsubscribe, spam, or bounce attribute is true.
  2. The user’s email address is missing, or the email attribute set in the campaign is invalid.
The Email Dropped event is specific to MoEngage.

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Why One-Time and Periodic Campaigns Show 0

MoEngage checks these drop conditions for every campaign — it just does so at different points:
  • In event-triggered and flow campaigns, the check runs when the email is about to be sent. Any user who fails the check is dropped at that moment, and MoEngage records an Email Dropped event for them.
  • In one-time and periodic campaigns, MoEngage runs the same check earlier, while building the target audience. These users are removed before sending starts, so there is no send to drop, and MoEngage does not record the Email Dropped event.
This is why a one-time or periodic campaign shows 0 for the Email Dropped event. It is expected, not an error.