Detect Catch-All Domains Before They Cost You
Catch-all domains silently accept all emails even when the mailbox does not exist, making standard SMTP checks unreliable. ValidoAPI identifies catch-all domains instantly and provides risk scores to help you decide.
Key Benefits
Detect catch-all configured domains that accept any email address
Receive risk scores (0–100) based on domain reputation and email quality signals
Segment catch-all emails separately for custom handling in your workflow
Combine with domain age and MX reputation signals for better scoring
Reduce hard bounces from catch-all emails that pass SMTP but bounce later
Configurable thresholds: accept all, accept cautiously, or reject catch-alls
Critical for B2B sales teams verifying corporate domain emails
Works in both single and bulk verification modes
Use Cases
B2B Sales & SDR Teams
Many corporate domains are catch-all configured. Identify these to prioritize outreach differently — follow up through LinkedIn or phone instead of cold email.
Email Marketing Platforms
Segment catch-all addresses from your verified list before sends. Treat them separately with lower volume and monitor bounce rates closely.
Lead Enrichment Services
Enrich leads with a catch-all flag and risk score so downstream teams can adjust their engagement strategy accordingly.
CRM Data Quality Teams
Identify catch-all contacts in your CRM database and assign them to a separate nurture track or validation queue for manual review.
Cold Email Agencies
Protect client sender domains by flagging catch-all addresses before loading campaigns. Maintain campaign health across all client accounts.
API & Data Platforms
Include catch-all detection in email enrichment APIs and data quality pipelines to provide more complete validation signals to downstream consumers.
Example API Response
{
"email": "contact@enterprise-company.com",
"status": "risky",
"score": 52,
"checks": {
"syntax": true,
"domain": true,
"mx_record": true,
"smtp": {
"connected": true,
"mailbox_exists": "unknown",
"is_catch_all": true
},
"disposable": false,
"catch_all": true
},
"catch_all_details": {
"is_catch_all": true,
"risk_level": "medium",
"domain_age": "5 years",
"mx_provider": "Google Workspace"
},
"response_time_ms": 198
}Frequently Asked Questions
What is a catch-all email domain?
A catch-all domain is configured at the server level to accept all incoming emails, regardless of whether the specific mailbox (username) exists. This means an SMTP check returns "accepted" even for non-existent addresses.
Why are catch-all emails risky for email marketing?
Because the SMTP server accepts any address on a catch-all domain, emails may appear to be "valid" but still bounce after delivery when the mail server processes the actual recipient. This can damage your sender reputation.
What risk score do catch-all emails receive?
ValidoAPI assigns catch-all emails a score between 30–65 depending on additional signals like domain age, MX provider reputation, and historical send data. The exact score helps you decide your acceptance threshold.
Should I reject all catch-all emails?
Not necessarily. Many legitimate corporate domains are catch-all configured. We recommend accepting them but monitoring bounce rates closely, limiting send volume, and adjusting based on your tolerance for bounces.
How does ValidoAPI detect catch-all domains?
We use SMTP verification with multiple test addresses. If the server accepts all test mailboxes regardless of their existence, we flag the domain as catch-all and assign an appropriate risk score.
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