Knowledge Base

Answers and Guides

Does MxToolbox Offer an API and What Are the Usage Requirements?

Yes — MxToolbox lists an API entry point on its site, so an API exists as part of the service. The MX Lookup page itself does not…

What MxToolbox Diagnostics and Blacklist Checks Tell You About Your Mail Server

MxToolbox's MX Lookup tool can tell you three things about your mail server: whether it is reachable and responding, whether its …

How to Use MxToolbox's MX Lookup Tool

Go to mxtoolbox.com's MX Lookup page, enter the domain you want to check, and submit it. The tool returns that domain's MX record…

What Are MX Records and Why Should You Look Them Up?

MX records are DNS entries that tell the internet which mail servers accept email for a domain, and in what order. You look them …

What Is MxToolbox?

MxToolbox is a free online network diagnostics platform best known for its MX Lookup tool, which lists a domain's mail exchanger …