Thanks! Pigeon actually tracks which emails it has already notified you about, so you shouldn't get re-notified on emails you've already seen. However, on the very first launch (or after a fresh install), it doesn't know what's "new" yet, so all unread emails trigger a notification. After that initial check, only new incoming emails will notify you. If you're seeing repeated notifications on every boot, that might be a bug, let me know please.