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MxToolbox

Fix the Problem·mxtoolbox.com

MxToolbox is a provider of email deliverability, DNS, and network diagnostic tools. Its SuperTool runs hundreds of free lookups (MX, SPF, DKIM, DMARC, BIMI, MTA-STS, TLS-RPT, blacklist, and more) to help engineers and email administrators monitor and troubleshoot their domains. Paid Delivery Center services add multi-monitor blacklist tracking, DMARC management, inbox placement testing, and mailflow monitoring.

What it's for

Look up MX records for a domainCheck a domain or IP against 100+ DNS blacklistsValidate SPF, DKIM, DMARC, BIMI, MTA-STS, and TLS-RPT recordsRun an all-in-one domain health report covering DNS, mail server, web server, and blacklist statusAnalyze raw email headersCheck email campaign inbox placement at providers like Google and Outlook.comMonitor sending and receiving mailflow latencyManage DMARC policy migration to reject and adopt BIMISimplify complex SPF records via SPF flatteningValidate a domain's /llms.txt file for AI agent discoverability

Features 20

Adaptive Blacklist Monitoring across sending IPs
BIMI Lookup
Blacklist Check across 100+ DNS blacklists
DKIM Lookup
DMARC Lookup
Domain Health report (DNS, mail server, web server, blacklist status)
Email Delivery Configuration Management for SPF/DKIM/DMARC
Email Header Analyzer
Inbox Placement testing at Google, Outlook.com, and other providers
LLMs.txt Lookup
MTA-STS Lookup
MX Lookup
Onboarding Support and Account Walkthrough
Outbound + Inbound Mailflow Monitoring
Recipient Complaint feedback via Google Postmaster and Feedback Loops
REST API access to lookups, monitoring, and reporting
SPF Flattening
SPF Lookup
SuperTool running 30+ lookups from one page
TLS-RPT Lookup

At a glance

free tierAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Forengineers, email administrators, IT professionals, technology professionals

CompanyMxToolbox, Inc.

Integrations

Google PostmasterOutlook.com

Resources

Pricing

Pricing includes free and paid tiers with specific features for each plan. Exact prices are available on request.

FreeFree

One free monitor, Access to top 30 blacklists

One free monitor with access to the top 30 blacklists

Paid (Delivery Center)Quote

No specific price disclosed on the pages; contact via phone or sign-up required.

Multiple monitors, more blacklists