How does Yahoo treat new domains or low-volume senders?

Yahoo treats new domains and low volume senders with heightened scrutiny during an initial evaluation period. Without established reputation, messages face stricter filtering as Yahoo's systems gather data about your sending behavior and recipient responses.

New senders should expect slower initial delivery, potential deferrals, and aggressive filtering until positive signals accumulate. Warming up gradually, starting with highly engaged recipients and low volumes, helps build trust. Sudden volume increases from new senders trigger spam flags.

Low volume senders face the challenge of thin data. With fewer messages, each complaint or bounce carries more weight in reputation calculations. This makes list quality critical: sending to even a few bad addresses can disproportionately damage reputation when volumes are small.