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intoDNS - IntoDNS checks the health and configuration and provides DNS report and mail servers report.
UptimeRobot - Free Website Uptime Monitoring
Dnsstuff - DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.
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.
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring