What’s the impact of shared vs dedicated IPs at Microsoft?

The impact of shared versus dedicated IPs at Microsoft is significant because Microsoft weighs IP reputation heavily in filtering decisions. Shared IPs pool reputation across multiple senders: one bad actor can damage deliverability for everyone sharing that IP.

Dedicated IPs give you full control over your reputation, but require sufficient volume to maintain consistent sending patterns. Microsoft views intermittent sending from dedicated IPs with suspicion, preferring steady, predictable volume patterns.

The choice depends on your volume and risk tolerance. High volume senders benefit from dedicated IPs where they control reputation entirely. Low volume senders may perform better on shared IPs managed by reputable ESPs, benefiting from established trust while accepting some shared risk.