When an Approved Email is forwarded to a group of email recipients, and one of these recipients unsubscribes from the email, the Channel_Value_vod field on the resulting Multichannel_Consent_vod record is populated with the email address of the original email recipient, not the person it was forwarded to who then clicked the unsubscribe link.
This is expected behavior. The unsubscribe link on a Sent Email is created when the email is processed by the Multichannel (MC) Engine, at the time the email is sent. This link is a static link that represents a specific Sent_Email_vod record, for a specific Account and Channel Value.
The link is not updated if the email is forwarded, and will continue to represent an opt-out link for the original recipient. This is true for any email, and is not solely an Approved Email limitation.
CRM Online Help: Components of Consent Capture
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