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SPF Toolbox

SPFtoolbox is a Javascript and PHP app to look up DNS records such as SPF, MX, Whois, and more

16 Alternatives To SPF Toolbox

DNSInspect

DNS is a free online service to check your domain’s servers for common DNS and mail errors and produces a report with explanations how to fix them.

Dnsstuff

DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.

Hund

Hund is a website that allows a business to create its own status pages. It lets a business monitor their status and keep customers informed on status changes.
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MailRadar

MailRadar is a Linux oriented community offering you free set of tools and latest news, articles…

Pingbreak

Pingbreak is an original and free monitoring service.
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Pingdom

With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
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RBLTracker

RBLTracker is the name of a free and easy to use backlist check service and backlist monitoring website over the internet that makes it easy for its users to check their domains and IP addresses.

RapidSpike

RapidSpike is an uptime and performance monitoring service for websites and web applications.

SolveDNS

SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.

Statusy

Statusy is, in short, an affordable solution for companies that need to provide a simple status page for their services. They remove the hassle from setting up and maintaining beautiful, yet functional status pages.

WebGazer

Monitor your website’s availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
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Webcron

Webcron - Website and Server Performance Monitoring and Online Web Cron. Reliable Cron Jobs Service with WebCron interface. The easiest way to set cron jobs.

intoDNS

IntoDNS checks the health and configuration and provides DNS report and mail servers report.

isUp

An intuitive website monitoring tool. You get: 25 monitors, checked every 3 minutes. Totally free!
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statuspage

A simple self-hosted status page site with an API written in Django under the BSD license.