Currently, when an email is forwarded via the Foward to a Friend feature, the token value will resolve to something other than what was in the initial email sent.
So for example, inside an email there is a token for a person of contact. This email was sent to me, with the following content, where Mark Eto is the person of contact token:
Mark Eto's event will be held at...
If I forward this email to a friend, I would expect the content to be unchanged. But if my friend is already a lead in the database, it would be changed to:
[SOMEONE ELSE]'s event will be held at...
Or if the lead does not exist in Marketo, it will look something like this:
's event will be held at...
If a Marketo email is forwarded, the assumption is that the content would be a 1:1 copy - exactly how the plain forward works in email clients. So essentially the token should be 'deactivated' when it is forwarded.