MXToolBox
MXToolBox provides free and paid DNS and email authentication diagnostic tools, including blacklist scanning across 105+ RBLs and a $129/month DMARC Delivery Center SaaS, serving IT administrators, SMBs, enterprises, and developers globally.
- Company typePrivate
- Founded1999
- HeadquartersAustin, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What MXToolBox does
MXToolBox, Inc., founded circa 1999 and headquartered in Austin, Texas, is a privately-held provider of network diagnostic and email authentication tools serving global internet operations. The company operates a two-tier product portfolio: a suite of free, no-registration diagnostic lookups (DNS, MX, SPF, DKIM, DMARC, blacklist scanning across 105+ DNSBLs, SMTP, and HTTP) that millions of IT professionals use to troubleshoot email delivery, and MxToolbox Delivery Center, a paid SaaS subscription ($129/month minimum, plus a premium Plus tier with SPF Flattening) that helps businesses progress to a DMARC Reject policy, configure SPF/DKIM/BIMI, monitor Adaptive Blacklist reputation, and run inbox placement tests. The underlying technology queries authoritative name servers directly and is protected by two granted US patents (10,839,353 B2 and 11,461,738 B2). A REST-based API extends the platform for developers and system integrators, and a managed services team assists customers with compliance against Google, Yahoo!, and Microsoft Outlook bulk sender requirements.
MXToolBox firmographics
Firmographics- Name
- MXToolBox
- Legal name
- MxToolbox, Inc.
- Website
- https://mxtoolbox.com
- Company type
- Private
- Founded year
- 1999
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- MXToolBox provides free and paid DNS and email authentication diagnostic tools, including blacklist scanning across 105+ RBLs and a $129/month DMARC Delivery Center SaaS, serving IT administrators, SMBs, enterprises, and developers globally.
- Ownership category
- akta.pro rank
MXToolBox industry classification
Industry- Product category
- Email Deliverability and Network Diagnostic Software
- NAICS
- Computer Systems Design and Related Services (54151)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Configuration Management & CMDB Services (BPAEAJAK)
Keywords
Where MXToolBox is headquartered
LocationHeadquarters
- HQ city
- Austin
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
MXToolBox business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Operations, Marketing or Sales, Others
Revenue model
- Delivery Center Subscription: SaaS subscription for DMARC email delivery management with features including SPF/DKIM/DMARC configuration, blacklist monitoring, inbox placement testing, and domain impersonation protection. Billed monthly at $129 per unit.
- API Usage: Usage-based API access for lookups and monitoring with free tier for testing and paid upgrades for higher transaction volumes. Supports integration with customer systems.
- Managed Services: Professional services team that helps customers setup DMARC, DKIM, SPF, BIMI and align with Google, Yahoo! and Outlook.com bulk sender policies
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | Delivery Center - Standard Plan |
| Subscription | Monthly | Delivery Center Plus - SPF Flattening |
| Freemium | Pay-as-you-go | API Free Tier |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels5 records
MXToolBox product offering
Product offeringCore offering
MXToolBox provides a free suite of online network diagnostic and email lookup tools (MX, DNS, SPF, DKIM, DMARC, blacklist checks) used by millions of IT professionals globally. Its paid product, MxToolbox Delivery Center, is a SaaS subscription for DMARC deployment, SPF/DKIM configuration, Adaptive Blacklist Monitoring across 100+ DNSBLs, BIMI support, Verified Sources management, deliverability diagnostics, and inbox placement testing. A REST-based MxToolbox API exposes these lookups and monitor operations programmatically for integration with third-party systems.
Product overview
MXToolBox offers a two-product portfolio: (1) MxToolbox, a suite of free online network diagnostic and lookup tools for IT administrators featuring DNS record validation, blacklist scanning across 100+ RBLs, SMTP diagnostics, and email header analysis; and (2) MxToolbox Delivery Center, a paid SaaS platform providing comprehensive email delivery management including DMARC deployment guidance, SPF/DKIM configuration, Verified Sources management, deliverability diagnostics, DMARC analytics, Domain Impersonation Protection, and Adaptive Blacklist Monitoring. Both products are accessible via the MxToolbox API for programmatic integration.
Differentiator
Problem solved
Functional benefit
Brands
- MxToolbox Delivery Center: DMARC Email Report and Email Delivery Solution that helps manage email configuration and troubleshoot email issues to improve email delivery.
- MxToolbox API
- MxWatch
Products and services
- MxToolbox (Free Network Diagnostic and Lookup Tools) Free online network diagnostic and lookup tool suite for IT administrators including MX lookup, DNS record validation (A, PTR, DNSSEC, DNS Propagation), blacklist scanning across 100+ RBLs/DNSBLs, SMTP diagnostics, email header analysis, and SPF/DKIM/DMARC lookups. Performs lookups directly against authoritative name servers for instant results and is available without registration, targeting IT professionals and small businesses globally.
- MxToolbox Delivery Center Paid SaaS platform for email delivery management and monitoring, providing DMARC deployment guidance to Reject policy, SPF and DKIM configuration, Verified Sources management, deliverability diagnostics, DMARC analytics, Domain Impersonation Protection, BIMI support, Adaptive Blacklist Monitoring across 100+ RBLs, Inbox Placement Testing, and MxWatch monitoring. Billed at $129 per month minimum with a 30-day satisfaction guarantee and targets businesses and enterprises requiring ongoing email authentication, deliverability, and inbox placement optimization.
- MxToolbox API REST-based API enabling programmatic access to MXToolBox lookup tools and monitoring services, supporting lookups for Blacklist (domain and IP), DNS (A, PTR, DNSSEC, DNS Propagation), Email (SMTP, MX, SPF, DKIM, DMARC), and Network (Ping, Portscan, HTTP), plus Monitor operations including check status, modify, add, and delete. Includes a free tier with limited lookups and paid upgrades for higher transaction volumes, with a test endpoint at https://mxtoolbox.com/api/v1/lookup/dns/example.com and integration use cases with ticketing systems, CRMs, email management tools, and marketing automation platforms.
Quantifiable outcome
- 1 Billion+ potential inbox reach through Google compliance
- +2 more outcomes
Companies that use MXToolBox
Customer profileSegments4 records
Ideal customer profiles3 records
MXToolBox technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Feature10 records
MXToolBox partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and minor.
- Amazon Web Services, Inc.coreAWS provides cloud infrastructure services including content delivery network and data storage for MXToolbox production systems in the United States.
- GooglecoreGoogle is a key inbox provider whose bulk sender requirements drive DMARC adoption. MXToolbox helps customers comply with Google's email sender guidelines to reach 1B+ Google inboxes.
- Yahoo!coreYahoo is a major inbox provider with bulk sender requirements. MXToolbox helps customers achieve DMARC compliance to deliver email to Yahoo inboxes.
- Outlook.com (Microsoft)coreMicrosoft Outlook.com is a major inbox provider requiring DMARC compliance for bulk senders. MXToolbox enables customers to meet these requirements.
- MailChannels CorporationminorMailChannels CEO Ken Simpson provided a testimonial recommendation for MXToolbox services.
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
MXToolBox competitors and assessment
Company assessmentRegional players
- Sendmarc: DMARC automation platform headquartered in South Africa, serving a similar email-authentication buyer persona with comparable DMARC/SPF/DKIM tooling; comparable product but primarily competing in EMEA/APAC geographies.
Direct peers
- EasyDMARC: Direct DMARC SaaS competitor offering SPF/DKIM/DMARC deployment, monitoring, and reporting tools — virtually identical product positioning to MXToolBox Delivery Center, often listed alongside it in buyer comparisons.
- Valimail: Direct DMARC-focused SaaS competitor. Valimail automates SPF/DKIM/DMARC configuration and monitoring for enterprises, overlapping directly with MXToolBox's Delivery Center product on the same buyer persona and use case.
- dmarcian: Specialist DMARC monitoring and deployment platform serving a similar SMB-to-enterprise email authentication buyer as MXToolBox Delivery Center, with comparable product scope around DMARC reporting and SPF/DKIM alignment.
Broad incumbents
- Validity (Return Path): Email deliverability and reputation platform (parent of Return Path and BriteVerify) that overlaps with MXToolBox on inbox placement testing, blacklist monitoring, and sender reputation analytics.
- Proofpoint: Large enterprise cybersecurity incumbent whose Email Fraud Defense product (formerly Return Path) competes in DMARC and email authentication at the high end of the market, where MXToolBox Delivery Center also targets enterprise accounts.
Emerging players
- GlockApps: Email deliverability testing and blacklist monitoring SaaS that competes directly with MXToolBox's free and paid diagnostics on spam folder placement, IP/domain reputation, and DMARC/SPF/DKIM checks.
- Postmark: Transactional email delivery service with strong deliverability tooling and DMARC guidance for senders; adjacent competitor for the email-authentication and deliverability buyer that MXToolBox also targets.
- MailerLite (MailboxValidator / email verification suite): Email marketing platform offering deliverability and verification tooling that overlaps with parts of MXToolBox's email diagnostics and reputation-checking capabilities for SMB senders.
Others
- Spamhaus: Authoritative DNS-based blacklist operator whose RBLs are queried by MXToolBox's 100+ blacklist-scanning capability; an ecosystem data provider rather than a direct competitor, but central to MXToolBox's underlying reputation data.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
MXToolBox social profiles
Digital presenceMXToolBox financial estimates
Financial estimateRevenue estimate
Valuation estimate
MXToolBox leadership team
Management profileNumber of profiles
Profiles1 record
MXToolBox funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
MXToolBox M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about MXToolBox
What does MXToolBox do?
MXToolBox provides a free suite of online network diagnostic and email lookup tools (MX, DNS, SPF, DKIM, DMARC, blacklist checks) used by millions of IT professionals globally. Its paid product, MxToolbox Delivery Center, is a SaaS subscription for DMARC deployment, SPF/DKIM configuration, Adaptive Blacklist Monitoring across 100+ DNSBLs, BIMI support, Verified Sources management, deliverability diagnostics, and inbox placement testing. A REST-based MxToolbox API exposes these lookups and monitor operations programmatically for integration with third-party systems.
Is MXToolBox a public or private company?
MXToolBox is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was MXToolBox founded?
MXToolBox was founded in 1999. It employs 11 to 50 people.
Where is MXToolBox based?
MXToolBox is headquartered in Austin, United States, in the North America region.
How does MXToolBox make money?
Three revenue lines are on record. Delivery Center Subscription is the primary driver. The others are API Usage and managed Services.
Who are MXToolBox's main competitors?
Sendmarc is listed as a regional player. Direct peers are EasyDMARC, Valimail and dmarcian. Broad incumbents are Validity (Return Path) and Proofpoint. Emerging players are GlockApps, Postmark and MailerLite (MailboxValidator / email verification suite). Spamhaus is listed as an others.
Does MXToolBox have an API?
Yes. MXToolBox offers a REST-based API that enables users to run lookups and query monitors programmatically. The API supports: Lookups for Blacklist (domain and IP), DNS (A, PTR, DNSSEC, DNS Propagation), Email (SMTP, MX, SPF, DKIM, DMARC), and Network (Ping, Portscan, HTTP); Monitor operations including check status, modify monitors, add monitors, delete monitors. The service provides a free tier with limited lookups and paid access for additional transactions. A test endpoint is available at https://mxtoolbox.com/api/v1/lookup/dns/example.com. Developer documentation is at knowledgebase.mxtoolbox.com/home/api.
What industry is MXToolBox in?
MXToolBox's product category is Email Deliverability and Network Diagnostic Software. Its primary akta.pro industry code is BPAEAJAK, Configuration Management & CMDB Services. Its NAICS code is 54151 and its SIC code is 7372.