Becoming paranoid and anxious when you don't receive any email for a long time. Most applicable to office mails when you otherwise receive a ton of them (with issues).
Bob: (in worried tone, holding stongly to his coffee in office) I haven't got a single mail from last 10 minutes! Something is wrong!
Kevin: Don't worry Bob, you're just experiencing email paranoia. Take a deep breath and relax, you would get your next shit load of issues soon.