There seems to be no way of changing your e-mail address on Digitial Ocean and I would personally like to change it on the fly due to my current address being spammed with phishers.
I agree - not for the same reasons, but for this one in particular - I had accidentally destroyed a droplet last night which housed my web site and emails. Of course, on the creation of a new droplet, they send a root password, but in this case, it would have been delayed until I reset my site up.
I had a backup of my site from the other day so was able to restore it on a different droplet to solve the issue of a root password being delayed because the site was offline.
Being able to change the email address in this case would have solved this problem and made it easier to get the new root password.
Please consider implementing this. :)
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