score.senderscore.comWhat it is
Sender Score is a reputation intelligence service operated by Validity (formerly Return Path) that assigns a numeric score from 0 to 100 to sending IP addresses based on complaint rates, spam trap hits, unknown user rates, and engagement signals. A score above 80 indicates a strong sending reputation; below 70 indicates problems; below 50 typically triggers filtering or throttling.
How it affects SMTP delivery
Queried by ESPs and large mail gateways as a reputation input. Unlike binary blocklists, Sender Score provides a gradient: high scores can actively improve inbox placement. Many ESPs use Sender Score as a factor in acceptance rate decisions and spam folder routing.
What causes a listing
Score decreases result from: high complaint rates, spam trap hits, unknown user / bounce rates above thresholds, and low engagement signals.
How to get removed
Sender Score improves automatically as sending behaviour improves. No manual override. Monitoring at senderscore.com provides detailed breakdown of contributing factors.
For the full reference catalog, see the email blocklist directory.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
About SMTPedia
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