Audit Email Domain Reputation
Before Your Emails Hit Spam
ScoreSender provides automated monitoring with scheduled checks into SPF, DKIM, DMARC, and 8 major public DNSBL blocklists. Perform an on-demand live DNS audit with zero signup required.
Built for Senders Who Depend on Clear Technical Visibility
Diagnostic tools to help audit domain authentication, monitor public blocklists on a configured schedule, and identify potential deliverability risks before sending.
Multi-Domain Radar
Monitor up to 5 domains or subdomains in your Early Access account from a unified security dashboard.
Scheduled Score Alerts
Receive notifications based on the configured monitoring schedule whenever your reputation score drops >10 points or a blocklist hit is detected.
30-Day Historical Trend Charts
Track reputation score snapshot history, policy updates, and deliverability signals using interactive Recharts analytics.
Developer REST API & Cron Jobs
Query domain reputation scores programmatically or trigger automated audits on your configured schedule.
How Monitoring Works
ScoreSender delivers independent diagnostic visibility into email deliverability signals. Understand how checks operate, how data is handled, and what reputation scores mean.
1. SPF, DKIM & DMARC
Core authentication protocols
We audit SPF TXT records for authorized sender IP ranges (ip4/ip6), test public DKIM key selectors (google, k1, etc.), and verify DMARC enforcement policies (p=reject vs p=quarantine).
2. DNSBL Blocklist Checks
8 configured public RBL feeds
Queries 8 configured public DNSBL feeds (Spamhaus ZEN, Barracuda BRBL, Spamcop, SORBS, etc.) against confirmed outbound mail-sending IPs. A hit is a material diagnostic signal requiring delisting investigation.
3. Schedule & Timestamps
Automated background monitoring
Checks run automatically on a configured schedule. Every reputation snapshot records and displays its exact execution timestamp (checked_at) so you always know when data was evaluated.
4. Provider Timeout & Unknown
Unreachable provider handling
Each DNS lookup enforces a strict 3,500ms timeout. If a remote DNS provider times out or is unreachable, the result is safely marked Unknown or Not Checked—never masked as a false Passed.
5. The 4 Diagnostic States
Passed, Unknown, Not Checked, Stale
- Passed (Clean): Check executed with no defects.
- Unknown: Provider timed out or unresolvable.
- Not Checked: Signal or selector unconfigured.
- Stale Data: Preserved prior snapshot pending refresh.
6. Web Server A Record Isolation
Website IP vs Outbound Mail IP
Your website's A Record points to web hosting (Vercel, Cloudflare, Nginx), which is not automatically a mail-sending IP. We extract sending IPs from SPF declarations (ip4/ip6) and MX records before querying DNSBLs.
7. Technical DNS Signals vs. Mailbox Provider Complaint Data (e.g. Gmail Postmaster)
ScoreSender monitors DNS, authentication, and public reputation signals. These signals are different from mailbox-provider data such as Gmail user-reported spam rates. A healthy DNS configuration does not guarantee a low complaint rate or inbox placement.
Technical DNS authentication and public RBL listings measure server setup and public flags. Mailbox providers (such as Gmail, Outlook, Yahoo) evaluate user-reported spam complaint rates, recipient engagement (opens/clicks), content analysis, and internal sender reputation histories.
Monitoring Limitations
To maintain full transparency, we clearly outline what ScoreSender measures and the technical boundaries of automated deliverability diagnostics.
Scores and statuses represent diagnostic indicators designed to highlight technical misconfigurations. They are not a guarantee of mailbox delivery.
Different ISPs (Gmail, Microsoft 365, Yahoo) use proprietary evaluation rules, recipient engagement histories, and local spam filters not visible to external DNS checks.
ScoreSender queries independent public DNS and DNSBL servers. Provider outages, rate limits, or network propagation delays can temporarily affect check outcomes.
DNS authentication (SPF, DKIM, DMARC) and public blocklists differ from mailbox complaint feeds (such as Gmail Postmaster spam complaint rates).
A 100/100 reputation score indicates proper technical configuration and clean public listings, but does not guarantee that every message avoids the spam folder.
Senders remain responsible for maintaining explicit subscriber consent, list hygiene, low bounce rates, and compliant email content.
Explore ScoreSender During Early Access
Explore ScoreSender during Early Access to gather real-world deliverability feedback. Pricing and limits may change as the product evolves.
Monitored Per Account
Add up to 5 domains or subdomains to your Early Access account with checks against 8 major DNSBL blocklists.
No Credit Card Required
Simply sign up with your email. Free during Early Access, subject to current Early Access terms.
Product Evolution
Optional tier pricing and quotas may evolve based on user feedback and operational costs.
Frequently Asked Questions
Transparent answers regarding our monitoring standards and data sources
Is ScoreSender affiliated with Google, Google Postmaster Tools, or Validity?
No. ScoreSender is an independent domain security and deliverability monitoring platform. We are not affiliated with, endorsed by, or sponsored by Google, Google Postmaster Tools, or Validity Inc. We query public DNS records, open IETF specifications (SPF, DKIM, DMARC), and 8 major public DNS-based blocklists (DNSBL) directly to calculate reputation health.
Is ScoreSender free during Early Access?
Free during Early Access, subject to current Early Access terms. Accounts receive 5 monitored domains with access to SPF/DKIM/DMARC auditing, blocklist checking against 8 major providers, and 30-day historical score snapshot charts.
Does ScoreSender guarantee inbox placement?
No. ScoreSender provides diagnostic visibility into selected deliverability signals. It does not guarantee that every message will reach the inbox. Mailbox providers like Gmail evaluate recipient engagement and internal filters in addition to technical DNS signals.
How does ScoreSender calculate the 0-100 Reputation Score?
Our scoring model uses a transparent weighted algorithm: SPF validation contributes 25 points, DKIM selector signatures contribute 20 points, DMARC policy enforcement contributes up to 25 points (p=reject receives full points), and public blocklist status across 8 major DNSBLs contributes up to 30 points. For full mathematical details, see our Methodology Page.