Hi!
Currently there is no such feature – but you could certainly export/email yourself the attendee list and then extract the email addresses that way. Would that be workable?
If not, we’d certainly be open to any feature requests you might post along these lines – but I tend to think this might be the domain of an extension/add-on or customization rather than something we’d build in to the ticketing plugin itself (though if there was sufficient demand it would certainly be given serious consideration).
Thanks!