An email address in the CC field also appears in the To field when an inbound email is updated in target record activity logs.
Steps to Reproduce
Create an email message with recipients in both the To and Cc fields and send it to the instance to be processed as an incident.
Process the email message by an inbound action. For example, Create Incident.
A new record is created/updated in the target table (for example, incident) and the received email is in the activity logs.
Note that the recipient in the Cc of the email is incorrectly also appearing in the To field.
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Related Problem: PRB704068