How quickly do complaints impact inboxing?

Complaint signals propagate quickly through provider systems. At Gmail, impacts can be visible within hours of a complaint spike. At Microsoft and Yahoo, the timeline is similar.

A single campaign that generates high complaints can damage deliverability for subsequent sends the same day. Providers react defensively to protect their users from what appears to be unwanted mail.

The speed of impact means you cannot "wait and see" with concerning complaint trends. By the time daily reports reveal a problem, the damage is already done.

Real-time monitoring during major sends helps catch issues before they compound.

Complaints are fast-acting signals. Unlike slow-building reputation factors, a complaint spike is like a fire alarm that triggers immediate response from harbor authorities.

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