Issue
The Results tab of a Smart Campaign with a filter for 'Send Email' is has more entries than the Send Email count on the Email Performance Report.
Solution
Page through the results as some Send Email activities will be 'Skipped Lead/Person already used up Daily/Weekly communication limit.'
Also, if some of the leads were sent the same email previously, outside the time frame of the report, they will not be included because they report only looks at the first time any given email was sent to a lead. Subsequent sends of the same email will not be included in the report.
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