Symptom
Unusually high number of opens or clicks on email sends.
Applies To
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Customers that utilize email safety/scanning systems such as Mimecast, Proofpoint, etc.
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Specifically customers with such systems configured for outbound messages.
Resolution
Outreach includes a header component on all outbound sends of "X-Outreach-Sent: true." An exception can be added to most email security systems for messages containing this header, in order to avoid erroneously registering message clicks/opens on your outbound sends.
Cause
Email security systems will often load any hyperlinks included in an email to ensure they don't point to malicious pages. In certain circumstances, these loads can be counted as "clicks."