Plain guides for teams that send from their own Google Workspace Gmail: sending limits, Postmaster Tools and how accurate open tracking really is.
DeliverabilityThe error means one Google account used up its daily sending quota. Here is which limit, how long it lasts, and how to recover safely.
DeliverabilityMany opens and some clicks aren't people. Here are the rules we use to spot them, and the signals worth acting on.
Oct 13, 2026 - 13 min Read
DeliverabilityReputation isn't in the v2 API. Spam rate, authentication, delivery errors and compliance status are, and they tell you what to fix.
Oct 13, 2026 - 13 min Read
