MxToolbox
Monitor your reputation, manage DMARC, diagnose issues, and improve inbox placement
About MxToolbox
MxToolbox is an email deliverability and DNS diagnostics platform known for its free SuperTool lookups (MX, blacklist, DMARC, SPF, DNS, and header analysis). Its paid Delivery Center adds inbox placement tests, DMARC reporting, recipient complaint data, adaptive blacklist monitoring, and round-trip mailflow monitoring for teams that depend on email reaching the inbox.
Pros & Cons
Pros
- Free SuperTool lookups cover MX, DNS, SPF, DMARC, blacklist, and header checks with no signup or install
- Blacklist checks span 100+ DNSBLs, a common first stop when mail starts bouncing
- Paid plans combine inbox placement, DMARC reporting, complaints, and mailflow monitoring in one dashboard
- Includes checks against Google, Microsoft, and Yahoo bulk sender requirements
- Long track record: the company has run email diagnostics since the early 2000s
Cons
- Big price jump from the free plan (weekly monitoring, 1 domain) to Delivery Center at $129/month
- Interface is tool-by-tool and technical, which reviewers say is hard for non-technical users
- Support scores lower than other areas in G2 reviews
- Both paid plans cap at 5 domains, which limits agencies and MSPs without a custom plan
Key Features
SuperTool Free Lookups
Free web lookups for MX records, DNS, SPF, DKIM, DMARC, reverse DNS, SMTP diagnostics, and email header analysis, queried directly against authoritative name servers.
Blacklist Checks and Monitoring
Checks IPs and domains against 100+ DNS-based blacklists (RBLs/DNSBLs), with adaptive monitoring that covers all sending IPs including third-party senders.
Inbox Placement Analysis
Tests whether a campaign lands in the inbox or spam at providers such as Google and Outlook.com, with analyses of why it failed and checks against Google, Microsoft, and Yahoo bulk sender requirements.
DMARC Reporting and Management
Processes DMARC aggregate reports into delivery performance dashboards and guides you from monitoring to a 100% reject policy.
Recipient Complaint Reporting
Pulls complaint data from Google Postmaster, feedback loops, and other provider mechanisms so you can fix sending lists and configuration.
Inbound and Outbound Mailflow Monitoring
Round-trip monitoring of email sending and receiving latency, showing hops and delays with alerts based on your thresholds.
BIMI Management
Helps you publish BIMI so your brand logo appears next to messages in supporting inboxes.
SPF Flattening
Reduces complex SPF records with many third-party includes to stay within DNS lookup limits (Delivery Center Plus).
Domain Impersonation Protection
Flags lookalike domains and spoofing attempts that target your brand.
Managed Services
Optional service where MxToolbox experts handle inbox placement, blacklist monitoring, SPF/DKIM setup, and DMARC enforcement for you.
Pricing
- Weekly blacklist monitoring
- 1 domain
- Free SuperTool lookups
- Inbox placement analysis: 30 per month
- Recipient complaint reporting
- DMARC email delivery performance reports
- Email configuration analysis (DMARC, SPF, DKIM)
- Adaptive sender blacklist monitoring
- Inbound + outbound mailflow monitoring
- BIMI management
- Domain impersonation protection
- 5 domains
- 500,000 email message volume
- Everything in Delivery Center
- Inbox placement analysis: 100 per month
- Advanced email delivery threat tools
- SPF flattening
- 5 domains
- 5,000,000 email message volume
Best For
Troubleshooting Bounced Email
IT admins run free MX, SMTP, and blacklist lookups to find why mail to or from a domain is failing.
DMARC Rollout
Teams use DMARC reports and configuration analysis to move a domain from p=none to a full reject policy without breaking legitimate senders.
Pre-Send Campaign Checks
Email marketers run inbox placement tests before a campaign to see whether Gmail and Outlook will route it to spam.
Ongoing Sender Reputation Monitoring
Businesses monitor sending IPs and domains for blacklisting and complaint spikes, with alerts when reputation drops.
MSP Email Health Checks
Managed service providers use the lookups and monitoring to audit client domains for SPF, DKIM, and DMARC issues.
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