Mxtoolbox

Online tool to check DNS MX records, diagnose email delivery issues, and scan for blacklists.

mxtoolbox.com

Verified API available Works with n8n Free tier ~230k monthly visits

Quick facts
What is it	Online tool to check DNS MX records, diagnose email delivery issues, and scan for blacklists.
Pricing	Freemium — from $129/mo
Free tier	Yes
Platform	Web Application
API	Yes
Works with	n8n
Best for	troubleshooting email delivery problems, verifying DNS configurations
Domain registered	2004

Data updated Aug. 1, 2026

What does Mxtoolbox do?

Mxtoolbox is an online utility that helps users diagnose and troubleshoot email delivery and DNS-related issues. Its primary function is to perform MX (Mail Exchanger) record lookups, showing the mail servers responsible for a domain in their correct priority order. The tool queries authoritative name servers directly, ensuring that any recent changes to MX records are reflected immediately in the results.

Beyond simple MX lookups, Mxtoolbox offers comprehensive diagnostic capabilities. Users can initiate a 'Diagnostics' test to connect to mail servers, verify reverse DNS records, perform basic Open Relay checks, and measure server response times. A key feature is its ability to check each identified MX record's IP address against a vast database of 105 DNS-based blacklists (RBLs or DNSBLs), helping users identify if their mail servers are listed and potentially impacting email deliverability.

This tool is particularly useful for system administrators, IT professionals, and website owners who need to ensure their email infrastructure is correctly configured and operating efficiently. It helps in quickly identifying common problems that lead to email bouncing or being marked as spam, making it an essential resource for maintaining reliable email communication.

Non-AI Developer Tools — Other

#blacklist-check#dmarc#dns-records#email delivery#email-health#mx-lookup#network-diagnostics

Key features

What makes it stand out

MX record lookup and priority listing

Direct query against authoritative name servers for instant results

Email server diagnostics including reverse DNS and Open Relay checks

Performance measurement of mail servers

Blacklist checking against 105 DNS-based blacklists (RBLs, DNSBLs)

Who is Mxtoolbox for?

Who benefits most from this tool

troubleshooting email delivery problems

verifying DNS configurations

checking mail server reputation

Pricing

Free tier available — start without a credit card

Free

Blacklist Monitoring: Weekly
Domain(s): 1
Number of Blacklist Monitors: 2
Number of Blacklists Checked: 30

Delivery Center

$129.0/month

Inbox Placement Analysis
Recipient Complaint Reporting
DMARC Email Delivery Performance Reporting
Email Configuration Analysis - DMARC, SPF & DKIM
Adaptive Sender Blacklist Monitoring
Inbound + Outbound MailFlow Monitoring
MxReputation™ Score
Domain Impersonation Protection
Domain(s): 5
Email Message Volume: 500,000
Blacklist Rest API Access
Bulk Lookups (Monthly): 20,000 IPs/Domains
Number of Blacklist Monitors: 64
Number of Blacklists Checked: 100+
Blacklist delisting support via email
Alerts
Rest API Access
SPF/DKIM/DMARC Configuration Analysis
Outbound Email Provider Reputation
DMARC: Fraud/Phishing Protection
DMARC & Email Delivery Events
Support (includes Blacklist Delisting Support): Email Support
Account Users: 5

Delivery Center Plus

$399.0/month

Inbox Placement Analysis
Recipient Complaint Reporting
DMARC Email Delivery Performance Reporting
Email Configuration Analysis - DMARC, SPF & DKIM
Adaptive Sender Blacklist Monitoring
Inbound + Outbound MailFlow Monitoring
MxReputation™ Score
Domain Impersonation Protection
Advanced Email Delivery Threat Tools
SPF Flattening
Domain(s): 5

Trust & presence

Search presence Top 10k site

Domain Domain registered 2004

Gallery

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