How does CSA define stable sending patterns?

CSA defines stable sending patterns as consistent, predictable volume that varies within normal bounds rather than spiking unpredictably. This consistency helps mailbox providers learn what to expect from your sending.

Stable patterns do not mean identical daily volume. Normal business variation is expected. But consistent weekly totals, predictable seasonal patterns, and gradual rather than sudden changes characterize stable sending.

Instability triggers scrutiny. Sudden volume spikes suggest compromised accounts, purchased lists, or spam campaigns. Maintaining relative stability, even as you grow, helps providers trust that changes represent legitimate business rather than problems.