MxToolbox Review — Honest Pros, Cons & Pricing (2026)

Category: Domain health and deliverability monitoring

Also known as: mxtoolbox.

Overview

MxToolbox is an essential free toolkit for anyone managing email infrastructure. The platform checks MX records, blacklist status, DNS configuration, SPF, DKIM, and DMARC records — all critical elements for cold email deliverability. Every cold email professional should have MxToolbox bookmarked. The free tools are sufficient for most use cases, with paid plans available for monitoring and alerting on infrastructure changes.

Pricing

Free tools available for basic checks. Paid monitoring plans available for ongoing alerting and comprehensive reporting.

Strengths

Free tools for MX, blacklist, DNS, SPF, DKIM, and DMARC checking
Essential diagnostic tool for email infrastructure troubleshooting
Comprehensive blacklist monitoring across hundreds of blacklists
Industry-standard tool used by email professionals worldwide
Quick, reliable checks with instant results

Weaknesses

Free tools are point-in-time checks — no ongoing monitoring without paid plans
Not a warmup or sending tool — diagnostic only
Paid plans needed for automated monitoring and alerting
Interface is functional but not modern

Best For

Every cold email professional — should be bookmarked and used regularly
Teams troubleshooting DNS configuration and deliverability issues
Infrastructure setup verification before launching campaigns

Not Ideal For

Teams looking for warmup or sending capabilities (diagnostic only)
Users expecting a modern, polished interface