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Custom Preheader is not set for Subscription Confirmation Message (and probably others) #736
Preheader is set really strange, as it starts its life as a header, "X-Preheader", which then gets set in email_template() as, 'email.preheader' and is then injected into the template vars.
This header can go through email header encoding, but it's not explicitely looked at, so it doesn't survive this encoding (which should be a bug in its own sense for that header encoding method, but regardless...)