Small email delays can be costly for your business. You need to track email system performance to anticipate delays before they affect your users and customers. You need peace of mind. You need the best. You need MxToolbox MailFlow Monitoring, featuring:

  • Round-trip SMTP monitoring
  • Inbound and outbound email tests and header analysis
  • Performance metrics and historical statistics
  • Configurable real-time alerts
  • Customizable timeouts

Get a complete picture of your mail server performance from the most trusted source, MxToolbox Mailflow Monitoring.


Comprehensive Statistics

MxToolbox’s MailFlow Monitor records statistics every 5 minutes, including:

  • Round-trip mail delivery time
  • Inbound processing time
  • Outbound queue delay
  • Email server response times
  • Support for Email-as-a-Service platforms

Uncover hourly, daily, weekly or monthly trends with drill-down charts.

Get peace of mind knowing your email servers are monitored, 24x7, by the best mailflow monitoring solution, MxToolbox Mailflow Monitoring.


Monitoring Multiple domains? No problem! We offer discounts on the volume of monitors.

Powerful, Easy-to-Use Interface

Our interface combines powerful user statistics, with ease of use and simplicity of configuration. Simply setup a mailbox on your server configured to forward email to us and let us know what email address to use. We’ll handle the rest. You can configure monitoring of individual mail servers in a cluster by setting a single IP, set timeouts and modify the frequency of your monitor.

Concerned about how Google Business Email or Microsoft Office365 is performing with your email? We support round-trip monitoring of Email-as-a-Service Platforms.


MxToolbox Professional Interface

All monitoring products come with access to MxToolbox Professional, our new, more powerful, highly regarded tools interface that combines lookups and monitors.

Other Professional Monitoring Services

Blacklist Monitoring

Email blacklists are a common way of reducing spam, but occasionally legitimate businesses end up on blacklists. Our highly lauded blacklist monitor will regularly check a mail server IP address or domain against a list of over 100 carefully-curated DNS-based email blacklists and alert you to any problem with your reputation. Most MxToolbox Professional packages include a number of standard monitors that can be used for blacklist monitoring. Learn More

DNS Monitoring

DNS changes can affect your business dramatically, so keeping tabs on your DNS records is incredibly important. MxToolbox offers best-in-class DNS record and change monitoring to ensure your business is alerted to potential issues like DNS hijacking and other unexpected DNS changes. Most MxToolbox Professional packages include a number of standard monitors that can be used for DNS monitoring. Learn More

API Access

Our RESTful API enables integration of our lookups and monitoring services with custom applications and databases. Leverage our extensive, highly acclaimed technology to enhance your system administration applications. Learn More

Domain Health

Our Domain Health Monitor is an all-in-one monitor for your entire domain’s well-being. Monitor your entire domain, including web server configuration and status, dns records and configuration, smtp email server configuration and status, plus blacklists.

You can purchase Domain Health monitoring packages in addition to your MxToolbox Professional subscription. Learn More

MxToolboxProfessional Features

  • Early Access to New Tools
  • NO Third Pary Ads
  • Recent Lookup History
  • My Favorites
  • Quick Watch Monitors
  • DNS Record Traversal
  • Batch Lookups
  • Killer "Tools"