Does anyone have experience dealing with secondary email addresses? For example, we recently held a conference where the registration process was run through an outside vendor. Some of the individuals registered with an email address that was different from what existed in Marketo. Thus, when it came time to send out email communications for the event via Marketo we ran into the issue of not being able to see that particular email address for event correspondence. We contacted Marketo Support and they mentioned you can add a custom field for secondary email addresses, but Marketo still chooses the primary email address when sending emails so that doesn't fully solve our issue.
What's the best way to go about something like this? Do you just upload the new email addresses into Marketo and create duplicates?