Email Health

Deliverability of the shared sending domain.

Every user's mail leaves as noreply@mail.peil.app, so reputation is a single shared asset: one account's complaints degrade delivery for everyone. Per-user email history cannot show that — the damage is only visible in aggregate, which is why this is an operator view and not a user-facing one.

Deliberately built on the negative signals only. Opens and clicks are not deliverability metrics and are actively misleading here: corporate mail gateways fetch every link on delivery, so a single scanned message can log several clicks and an open with no human involved (observed July 2026 — four clicks in the delivery minute, before the first open). Bounces and complaints have no such automated analogue.