How does reputation differ between shared and dedicated IPs?

Shared IPs pool reputation across all senders using that address. You benefit from the collective positive sending but also suffer from neighbors' mistakes. The ESP manages pool health, removing bad actors to protect everyone.

Dedicated IPs give you complete ownership of your reputation. Your sending behavior alone determines trust. No one else can damage your standing, but you also cannot lean on others' good reputation during warmup.

Dedicated IPs require sufficient volume, typically at least 100,000 messages per month to maintain enough sending activity for providers to evaluate. Low-volume senders on dedicated IPs often struggle because there is not enough data to establish stable reputation.

Shared IPs are like sailing with a convoy. You benefit from safety in numbers but move at the fleet's pace. Dedicated IPs mean sailing alone, fully responsible for your own navigation.