How often should I run MX Toolbox checks on my domain?

Running checks after any DNS changes or when experiencing email delivery issues is recommended; for routine monitoring, weekly or monthly intervals are sufficient for most domains.

What do the blacklist results mean if my domain appears on a list?

If your domain appears on a spam blacklist, it means some email recipients' servers have flagged it; you should review the specific list's removal process and ensure your email practices comply with anti-spam guidelines.

Can MX Toolbox fix email delivery problems for me?

No, MX Toolbox only diagnoses issues; it does not modify your DNS records or server configuration. You will need to update your domain's DNS settings or contact your hosting provider to resolve any identified problems.

Does MX Toolbox test IPv6 connectivity as well as IPv4?

The tool primarily focuses on standard DNS and SMTP tests; IPv6 support varies by specific test, but core functionality like MX record lookup works for both address families.

NetworkFree Tool

MX Toolbox

Provided byMX Toolboxmxtoolbox.com

Comprehensive DNS, email, and network diagnostics — MX records, blacklist checks, SMTP tests, SPF/DKIM/DMARC, and more.

Use This Tool

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Screenshot of MX Toolbox on MX Toolbox — mxtoolbox.comOpen the live tool →

About this tool

What MX Toolbox does

MX Toolbox is a web-based suite of network diagnostics that lets users examine the technical health of any domain. By entering a website or domain name, the tool runs a series of tests that reveal DNS configuration, email routing, and server connectivity. The primary output includes MX records that show where email should be delivered, along with analyses of SPF, DKIM, and DMARC authentication records. It also checks the domain against known spam blacklists and tests basic SMTP connectivity to verify mail server functionality. The results provide a comprehensive snapshot of a domain's infrastructure, making it easy to spot configuration errors or deliverability issues at a glance.

Step by step

How to use the MX Toolbox MX Toolbox

1
Open MX Toolbox and enter the domain name you want to investigate in the search field
2
Select the specific diagnostic tests you want to run from the available options
3
Review the generated report which lists MX records, blacklist status, and SMTP test results
4
Examine the SPF, DKIM, and DMARC authentication details shown in the output
5
Use the provided explanations to interpret any flags or warnings for your domain

Is it right for you

Best for

IT professionals, system administrators, and web developers who need to quickly diagnose email delivery problems, verify DNS configurations, or check a domain's blacklist status without installing specialized software.

Limitations

Results are based on a single point-in-time query and may not reflect ongoing issues
The interface contains multiple sections and ads that can be overwhelming for new users
Free version has limited customization options for advanced diagnostic parameters

Questions

MX Toolbox FAQ

How often should I run MX Toolbox checks on my domain?: Running checks after any DNS changes or when experiencing email delivery issues is recommended; for routine monitoring, weekly or monthly intervals are sufficient for most domains.
What do the blacklist results mean if my domain appears on a list?: If your domain appears on a spam blacklist, it means some email recipients' servers have flagged it; you should review the specific list's removal process and ensure your email practices comply with anti-spam guidelines.
Can MX Toolbox fix email delivery problems for me?: No, MX Toolbox only diagnoses issues; it does not modify your DNS records or server configuration. You will need to update your domain's DNS settings or contact your hosting provider to resolve any identified problems.
Does MX Toolbox test IPv6 connectivity as well as IPv4?: The tool primarily focuses on standard DNS and SMTP tests; IPv6 support varies by specific test, but core functionality like MX record lookup works for both address families.

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