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

Category: Domain health and deliverability monitoring

Website: mxtoolbox.com

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