Will an email token work if used as the default value? We're also looking at an example where most traffic won't have parameters but we want to keep the email field hidden.
I wasn't able to get this to work on an external landing page, but am wondering if this would work on a Marketo landing page.
A {{lead.token}} can't be used on an non-Marketo LP.
On a Marketo-hosted LP, if you want the Email Address field to be hidden, just set the type to Hidden, enable Pre-Fill, and also enable Auto-Fill from a URL param with the default value {{lead.Email Address}}. The URL param will take precedence, if non-empty (i.e. an empty but present URL param, like ?email=&utm_campaign=blah... will not set the value to empty but will use the existing lead value).
That is the way to do it but I would, if possible, see if you can encrypt/decrypt the string and not pass emails in the URL as plain text - otherwise your database could be open for rogue unsubscribes.
Unless you mean leaving it encrypted all the way to the back end (necessitating a custom, very complex back-end workflow that I don't know that anybody is actually doing in reality) then you can already post the form on behalf of whomever you choose.
It's also possible that your CC staff could unsubscribe leads themselves. You'd just want to be sure that munchkin was removed from the page so their browsers didn't get cookied as the lead's themselves. You can find instructions for that below.
You need to remove the _mkto_trk cookie / _mkt_trk field from the form as well, not just remove Munchkin (because staff will already have a Munchin cookie).
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