Q: What’s the best way to keep nosy co-workers from standing over your shoulder and reading your e-mails?
A: Ask them to stop. In a case like this it is OK to be direct. While open office style workplaces may encourage some co-workers to participate in this kind of space invading, it’s unprofessional at best. Simply say, “Frank, I’ll have to ask you to step back from my computer. I’m working a project that’s not for public consumption.” If the behavior continues you could talk to a supervisor.