[KomoD]

Sounds like a good time to involve the cops possibly? Sounds illegal to me...? They'll be able to link the protonmail and gmail accounts back pretty easily I assume

If there's some kind of staff site/portal/whatever with authentication, send them a unique link and somehow trick them into clicking it?

[sudoaptinstall]

It's very much illegal to take the parent emails. The authorities have been contacted, but that route takes time. The person is sending a few emails a week now. From the content we have narrowed it down a handful of people, but there's nothing solid that we can take steps with.