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Traditional Validators
- — SMTP handshake returns “valid” for every address on the domain
- — Cannot detect abandoned or never-used mailboxes
- — Label entire catch-all domains as “accept-all: unknown”
- — Force you to guess which addresses are real
AI-Powered Email Scoring
“Valid” tells you nothing.
The score tells you everything.
Every email tool gives you a binary answer: valid or invalid. That works until you hit a catch-all domain, and suddenly 30% of your list is labeled “valid” when half those addresses are dead. VeriFox scores every email 0–100 using 40+ behavioral signals so you know exactly which addresses will bounce.
Every email gets a confidence score · Not just valid/invalid
SCORES FROM 500 MILLION+ EMAILS ANALYZED
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Accuracy on catch-all domains
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Behavioral signals analyzed
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Average scoring latency
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Fewer bounces vs. binary tools
The price of guessing
One unscored campaign can wreck your sender reputation for 72 hours.
2%+
Bounce Rate Threshold
Most ESPs start throttling or suspending your account when your bounce rate exceeds 2%. A single campaign to an unscored list can cross this line.
30%
Catch-All Prevalence
Roughly 30% of B2B domains are configured as catch-all. If you skip scoring, nearly a third of your list is a blind spot.
72hrs
Reputation Recovery
Once sender reputation drops, it takes 72+ hours for ESPs to re-evaluate your domain. During that window, even good emails land in spam.
The catch-all problem
What is a catch-all email?
A catch-all domain accepts mail sent to any address, whether the mailbox exists or not. The mail server responds with “250 OK” to every RCPT TO command. Traditional validators mark every address as valid — and you’re left guessing.
RCPT TO: sales@acme.com 250 OK (Accepted)
RCPT TO: asdf123xyz@acme.com 250 OK (Accepted)
Both get the same “accepted” response. Only one is a real person.
The industry gap
Why other validators fail at catch-all domains
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VeriFox AI Scoring
- — Goes beyond SMTP to analyze behavioral engagement data
- — Detects inactive and abandoned mailboxes on catch-all domains
- — Returns a confidence score (0–100) instead of “unknown”
- — Gives you a clear action for every address
How it works
AI scoring that goes deeper than SMTP
CATCH-ALL DETECTION
See through catch-all domains that fool every other tool
When a mail server is configured to accept everything, traditional validators give up and label the entire domain 'unknown.' Our behavioral engine analyzes engagement signals behind the SMTP response to separate real inboxes from black holes.
- Behavioral fingerprinting on 40+ engagement signals
- Historical bounce pattern analysis per domain
- Real-time confidence scoring even on accept-all servers
- Works on enterprise catch-all configurations (Google, Microsoft 365)
ENGAGEMENT INTELLIGENCE
Know if the person behind the address is actually active
A valid email address means nothing if the owner hasn't opened a message in 6 months. Our scoring engine detects dormant, abandoned, and secondary inboxes before you waste sends on them.
- Open/click recency detection across multiple ESPs
- Device diversity analysis (active users check email on multiple devices)
- Reply cadence modeling to estimate engagement likelihood
- Send-receive ratio analysis to spot dead or bot-managed accounts
RISK CLASSIFICATION
Every address gets a clear action — not an ambiguous 'unknown'
Binary valid/invalid leaves you guessing on the 30% of addresses that sit in the gray zone. Our 4-tier scoring system gives you a specific recommended action for every single email on your list.
- Safe (85-100): send with full confidence
- Worth a Look (50-84): segment into slower cadence
- Risky (20-49): exclude from primary campaigns
- Do Not Send (0-19): remove immediately to protect reputation
Behind every score
What happens in 50 milliseconds
Four stages, 40+ signals, one score.
01
Behavioral Fingerprint
Cross-reference 40+ engagement signals: open timestamps, click recency, reply cadence, device diversity, and send-receive ratios to build a behavioral profile for each address.
02
Catch-All Intelligence
Probe the mail server beyond a simple RCPT TO check. Analyze domain-level patterns, historical bounce data, and known catch-all configurations to distinguish real mailboxes from black holes.
03
Pattern Analysis
Compare the address against millions of known patterns: role accounts, disposable providers, sequential generators, and common fake-address templates.
04
Score Synthesis
Aggregate all signals into a single 0-100 confidence score with a tier assignment: Safe, Review, Risky, or Do Not Send. No ambiguous 'unknown' bucket.
What your score means
Every email gets a verdict.
Click a tier for the action.
No more ambiguous “unknown” buckets. Each address receives a 0–100 confidence score mapped to a clear tier with a specific recommended action.
Your team, your workflow
Marketers score before campaigns.
Sales scores before outreach.
Email Marketers
- →Segment lists by score before every campaign
- →Send high-value offers only to 85+ addresses
- →Reduce bounce rates below 2% consistently
- →Protect domain reputation from catch-all traps
Sales Teams
- →Score prospect lists before cold outreach
- →Prioritize leads with high-confidence emails
- →Avoid wasting sequences on dead addresses
- →Increase reply rates by filtering noise
Developers
- →Real-time scoring via REST API
- →Webhook callbacks for batch processing
- →Build smarter signup validation flows
- →Integrate with any CRM or ESP
Email Marketers
- →Segment lists by score before every campaign
- →Send high-value offers only to 85+ addresses
- →Reduce bounce rates below 2% consistently
- →Protect domain reputation from catch-all traps
Sales Teams
- →Score prospect lists before cold outreach
- →Prioritize leads with high-confidence emails
- →Avoid wasting sequences on dead addresses
- →Increase reply rates by filtering noise
Developers
- →Real-time scoring via REST API
- →Webhook callbacks for batch processing
- →Build smarter signup validation flows
- →Integrate with any CRM or ESP
Scores update in real-time · Works on catch-all domains · API access included · No credit card required
Stop guessing. Start scoring.
200 free AI scores with every new account. No credit card. See exactly which emails are worth sending to.
AI scoring included with every plan · REST API access · No contracts