For example, ruby-openai.gemspec has spec.authors = ["Alex"] spec.email = ["alexrudall at users.noreply.github.com"] This was resulted in Upstream-Contact: ["alexrudall at users.noreply.github.com"] At least [" and "] should be removed (ftp masters once commented when I did not remove it). Ideally it should be Upstream-Contact: Alex <alexrudall at users.noreply.github.com> (@ replaced with at).