[darinpantley]

I changed my email address in ~200 accounts and only had trouble updating a few: BuiltIn, CPUID, Flickr, Kakao, JCrew, Nord, and Steiger.

After I contacted Kakao support, they asked for some documents. Then they called me to verify the details. A day or two later, they updated my online profile with an editable email field, so I was finally able to update my email address.

When I contacted JCrew chat support, they performed the update immediately and emailed me a temporary password from [e-mail].

Flickr and Steiger were also happy to help. TBD on the others.

So I can't think of any accounts that don't allow an email change either. But you might have to jump through some hoops.