What are SNDS and Postmaster APIs used for?
**SNDS** (Smart Network Data Services) from **Microsoft** and Postmaster APIs from **Gmail** provide **MBP**-side reputation data directly from the source. They show how these major providers view your sending reputation.
**SNDS** shows: **IP reputation** status, spam complaint rates, trap hits, and filter results for email to **Microsoft** properties. It's the authoritative view of your standing with **Outlook**, Hotmail, and related services.
**Gmail Postmaster Tools** shows: domain and **IP reputation**, spam rates, authentication success, delivery errors, and encryption status. For **Gmail**, which often represents significant list portions, this data is essential for understanding delivery.
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