For sales emails, you have to use a "...Sales Email" filter, not an "...Email" filter. And you can't use "is" as the operator for the sales emails filters (e.g. Clicked Link in Sales Email, Was Sent Sales Email, etc.) because the argument is the subject line of the email, not the name of the email and Marketo tacks on a different ID number to the end of the subject of every sales email that is sent. So you have to use a "starts with" or "contains" operator with your sales email filters.