Free email reputation measurement tool provided by Validity that rates sender IP reputation on a 0-100 scale to help monitor email deliverability.

Sender Score is a free reputation rating service for email senders, provided by Validity, that rates IP reputation on a scale from 0 to 100. The score is calculated using reputation-affecting data including complaints, traps, and deliverability metrics pulled directly from mailbox providers and message security agencies. Sender Score data comes from the Validity Data Network, which includes more than 80 mailbox and message security providers globally. Scores above 80 generally boost inbox placement rates.
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Email on Acid is a comprehensive automated email pre-deployment platform that helps email developers and marketers test emails across the most popular clients and devices. The platform provides campaign precheck, accessibility testing, and deliverability analysis.