# MXToolBox, Inc.

**Source:** https://www.startuphub.ai/startups/mxtoolbox
**Profile type:** Startup

> MXToolBox provides free online tools and paid services for email delivery, DNS, and network diagnostics to IT and email professionals.

## About

MXToolBox offers a comprehensive suite of online tools for network administrators and IT professionals to diagnose and resolve mail server, network, and domain issues. The platform provides free diagnostic tools like MX Record Lookup, Blacklist Check, DNS Lookup, and SPF, DKIM, and DMARC verification, alongside paid email delivery solutions and managed services for proactive monitoring and troubleshooting. Their services help businesses navigate complex email reputation issues, ensuring smooth and efficient email operations.

## Key facts

- **Slug:** mxtoolbox
- **Website:** https://mxtoolbox.com
- **Location:** Austin, United States
- **Founded:** 2003-01-01
- **Employees:** 13
- **Operating status:** Active
- **Sectors / tags:** Network Management Software, Email Security, DNS Management, Email Deliverability, IT Management
- **Social:**
  - LinkedIn: https://www.linkedin.com/company/mxtoolbox
  - Twitter: https://x.com/mxtoolbox

## StartupHub.ai scores

- **Ahrefs DR:** 89/100
- **Effective DR:** 8/100
- **Agent Readiness:** C (61/100)
- **Site Speed:** 73/100
- **Data Trust:** 84/100

## Tech stack

Detected on mxtoolbox.com, last scanned 2026-11-04.

- **Frontend:** Bootstrap
- **CMS / Builders:** WordPress.com
- **CDN:** AWS CloudFront
- **Hosting:** AWS
- **Email provider:** Google Workspace

## JSON-LD

Structured data aligned with this page's `<script type="application/ld+json">` (included when the profile is server-rendered).

```json
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "BreadcrumbList",
      "itemListElement": [
        {
          "@type": "ListItem",
          "position": 1,
          "name": "Home",
          "item": "https://www.startuphub.ai"
        },
        {
          "@type": "ListItem",
          "position": 2,
          "name": "Startups",
          "item": "https://www.startuphub.ai/startups"
        },
        {
          "@type": "ListItem",
          "position": 3,
          "name": "MXToolBox, Inc.",
          "item": "https://www.startuphub.ai/startups/mxtoolbox"
        }
      ]
    },
    {
      "@type": "ProfilePage",
      "@id": "https://www.startuphub.ai/startups/mxtoolbox#webpage",
      "url": "https://www.startuphub.ai/startups/mxtoolbox",
      "name": "MXToolBox, Inc. - AI Startup Profile | StartupHub.ai",
      "description": "This is the StartupHub.ai profile of MXToolBox, Inc.. MXToolBox, Inc. is a startup founded in 2003, operating in Network Management Software and Email Security. MXToolBox provides free online tools and paid services for email delivery, DNS, and network diagnostics to IT and email professionals. Headquartered in Austin, United States. The company has approximately 13 employees.",
      "dateModified": "2026-11-04T12:19:05.052Z",
      "mainEntity": {
        "@type": "Organization",
        "@id": "https://www.startuphub.ai/startups/mxtoolbox#organization"
      }
    },
    {
      "@type": "Organization",
      "@id": "https://www.startuphub.ai/startups/mxtoolbox#organization",
      "name": "MXToolBox, Inc.",
      "url": "https://mxtoolbox.com",
      "logo": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/logos/02b17f48-46ca-4b2c-a269-24fff940cfcd-square.webp",
      "image": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/logos/02b17f48-46ca-4b2c-a269-24fff940cfcd-square.webp",
      "description": "MXToolBox offers a comprehensive suite of online tools for network administrators and IT professionals to diagnose and resolve mail server, network, and domain issues. The platform provides free diagnostic tools like MX Record Lookup, Blacklist Check, DNS Lookup, and SPF, DKIM, and DMARC verification, alongside paid email delivery solutions and managed services for proactive monitoring and troubleshooting. Their services help businesses navigate complex email reputation issues, ensuring smooth and efficient email operations.",
      "sameAs": [
        "https://www.linkedin.com/company/mxtoolbox",
        "https://x.com/mxtoolbox"
      ],
      "foundingDate": "2003-01-01",
      "numberOfEmployees": {
        "@type": "QuantitativeValue",
        "value": 13
      },
      "address": {
        "@type": "PostalAddress",
        "addressLocality": "Austin",
        "addressCountry": "US"
      },
      "knowsAbout": [
        "Network Management Software",
        "Email Security",
        "DNS Management",
        "Email Deliverability",
        "IT Management"
      ]
    }
  ]
}
```

## Community reviews

Community reviews below were gathered from public sources into one place. Each quote is copied word for word and links to where it was posted.

- **Reddit r/deliverabilitytips** | Aerosaul | 2026-10-07 | mixed | highlighted endorsement
  > "Been using MXToolbox forever; finally went looking for alternatives for deliverability. I've had MXToolbox bookmarked since roughly 2019 and I'd guess a lot of you have too. It's kinda a reflex at this point, right? When something looks wrong with a domain, you paste it in, you get your answer in three seconds. Blacklist check, MX records, SPF syntax, DNS propagation, all of it. It's still excellent for all that and I'm not planning to stop using it. But I hit a wall with it last year that I think a lot of people hit and don't articulate, so here's my attempt. MXToolbox tells you whether your setup is correct but it doesn’t tell you whether your email is landing. Those are wildly different q"
  > Source: https://www.reddit.com/r/deliverabilitytips/comments/1wzxe7l/been_using_mxtoolbox_forever_finally_went_looking/
- **Reddit r/gsuite** | QLHB | 2026-09-22 | negative | highlighted criticism
  > "I check on MXtoolbox it says that my DNS record not found. What do I need to do to fix this? Thank you in advance guys."
  > Source: https://www.reddit.com/r/gsuite/comments/1wn4in1/my_workspace_cannot_receive_email/
- **Reddit r/gohighlevel** | Realistic-Coach-3781 | 2026-10-17 | mixed
  > "I checked the sending domain and IP on MXToolbox and neither appears on any listed blacklists."
  > Source: https://www.reddit.com/r/gohighlevel/comments/1x8autl/need_advice_emails_keep_going_to_spam_in_ghl/
- **Reddit r/email** | One-Suggestion-7906 | 2026-10-11 | mixed
  > "Of course DKIM, SPF and DMARC are ok, and IP is not listed in RBLs as per MXToolbox and others as Proofpoint or Trendmicro."
  > Source: https://www.reddit.com/r/email/comments/1x3ldqf/mails_from_external_domains_not_received_in/
- **Reddit r/dns** | BelgianWarriorBear | 2026-09-24 | mixed
  > "How can I figure out why I got a different response from a tool at keycdn that I cannot reproduce with any other tool like mxtoolbox?"
  > Source: https://www.reddit.com/r/dns/comments/1wottww/response_header_is_different_from_key_cdn/
- **Reddit r/sysadmin** | One-Suggestion-7906 | 2026-09-16 | mixed
  > "Of course DKIM, SPF and DMARC are ok, and IPs are not listed in RBLs as per MXToolbox. We do not admin Microsoft 365 accounts."
  > Source: https://www.reddit.com/r/sysadmin/comments/1wi1n6u/mails_from_external_domains_not_received_in/