What do mean not reliable?

Not reliable that we get anything that looks like an email address?
or that we get a valid email address that we can send emails to?
If we get something that passes JSON validator I'm happy. People will probably get better service, if they provide something they can validate with persona.

If people uses a random string containing a "@" as email in their commit message that is okay with me. But most people use a valid email and over time we can probably allow people cancel pending things if they login with persona (validating that they hold the given email).

We can probably allow `@mozilla.com` people to cancel and change priority of any task or task-graph. But `@something-else` people logged in with persona should probably only be able to down-prioritize and cancel their own task and task-graphs.

I don't like using github username here because this will also cover uses outside github.

**Note** cancelling and prioritization is just a few of the things I see people doing with owner emails. We can also use them to gather statistics... Default priorities... and permissions. Or who knows.