Complete Blacklist Protection
According to Return Path research, blacklisted IPs see an average 25% drop in inbox placement rates. MailOdds monitors your sending infrastructure continuously so you can catch and resolve listings before they impact deliverability.
Real-time DNSBL Checks
Check any IP address or domain against 50+ DNS-based blacklists instantly. Results include return codes, listing reasons, and remediation links.
IPv4 and IPv6 Support
Full support for both IPv4 and IPv6 address monitoring. Check all your sending infrastructure regardless of address type.
Continuous Monitoring
Automated checks at configurable intervals with instant alerts when a new listing is detected. Know about problems before your recipients do.
History Tracking
Complete blacklist history with listing and delisting timestamps. Track how long each listing persisted and which blacklists are most frequent.
Delisting Guidance
Step-by-step remediation instructions when a listing is detected. Direct links to delisting forms and specific guidance for each blacklist operator.
Multi-IP Monitoring
Monitor all your sending IPs and domains from one dashboard. Unlimited monitors on paid plans with centralized alerting and reporting.
From Check to Resolution
Blacklist monitoring is only useful if it leads to action. MailOdds takes you from detection through remediation with clear, actionable steps at every stage.
- Add your IPs and domains as monitors
- Automated checks run at configurable intervals
- Instant alerts when a new listing is detected
- Guided delisting with direct links to removal forms
Detect
DNS lookups against 50+ blacklists identify listings within minutes. Return codes reveal the specific reason for each listing.
Alert
Instant notifications via webhook, email, or dashboard alert. Know about new listings before your recipients notice deliverability problems.
Resolve
Blacklist-specific remediation instructions with direct links to delisting forms. Track removal progress until the listing is confirmed cleared.
Blacklist Check API
Check any IP or domain against 50+ blacklists with a single API call. Set up monitors, retrieve history, and manage alerts programmatically.
curl -X POST https://api.mailodds.com/v1/blacklist-check \
-H "X-Api-Key: mo_live_..." \
-H "Content-Type: application/json" \
-d '{
"ip": "198.51.100.42"
}'
# Response
{
"data": {
"ip": "198.51.100.42",
"listed": true,
"listings": [
{
"blacklist": "zen.spamhaus.org",
"listed": true,
"return_code": "127.0.0.2",
"detail": "SBL - Spamhaus Block List"
},
{
"blacklist": "b.barracudacentral.org",
"listed": false,
"return_code": null,
"detail": null
}
],
"total_checked": 52,
"total_listed": 1,
"checked_at": "2026-03-15T14:32:00Z"
}
}50+ Blacklists Checked
MailOdds checks the blacklists that actually matter for email deliverability. From the most widely adopted DNSBLs to niche lists used by specific providers.
Protect Your Sender Reputation
Blacklist monitoring works alongside sender reputation scoring, DMARC monitoring, and the full deliverability platform to keep your email reaching the inbox.
Sender Reputation
Monitor your overall sender reputation score and identify factors affecting inbox placement.
DMARC Monitoring
Track DMARC, SPF, and DKIM alignment. Catch unauthorized senders and configuration drift.
Deliverability Platform
The full MailOdds platform: validate, send, monitor, and optimize your email deliverability.
Frequently Asked Questions
Stop losing revenue to typos, bots, and blind spots.
From typo correction to storefront attribution. One platform, one API, nothing stitched together.