Is “Sender Score” the same as mailbox reputation?

Sender Score and mailbox provider reputation are different things:

Sender Score is a third-party metric from Validity that rates IP addresses based on their data network. It provides one perspective on reputation.

Mailbox provider reputation (Gmail, Outlook, Yahoo) is calculated internally by each provider using their own data, algorithms, and signals. These determine actual inbox placement.

A high Sender Score does not guarantee good Gmail reputation. A moderate Sender Score does not mean Outlook will block you. Each system operates independently.

Sender Score is useful as a directional indicator and early warning system, but it does not directly predict deliverability at any specific provider.

Sender Score is one inspector's rating. Mailbox reputation is each port authority's own assessment. They may correlate, but each makes independent decisions about your cargo.