First <first@example.com> <old@example.com>
Second <OLD@example.com>
<last@example.com> <old@example.com>
<other@example.com> <other-old@example.com>
Other <other-old@example.com>
Fallback <fallback@example.com> <shared@example.com>
Earlier <earlier@example.com> Jane <shared@example.com>
<later@example.com> jAnE <SHARED@example.com>
