HEATKEYS

Wormly offers server monitoring, website monitoring and uptime monitoring to keep you online and performing fast. Remote monitoring from outside the firewall alerts you when failures occur, while internal server health monitoring reveals problems bef...

UltraTools is a complete set of free DNS and domain tools, which test the health of your domain name servers, websites and online hosting environment.

Email Security Grader: Is your mail server secure? Take the test and get a security score for your corporate mail infrastructure.

Hosting.com

IT Best Practices, How-tos, Product Reviews, discussions, articles for IT Professionals in small and medium businesses

DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering. Explore monitoring products and free DNS tools at DNSstuff.

intoDNS checks the health and configuration of DNS and mail servers.

Mailtrap is a fake SMTP server for development teams to test, view, share transactional and other emails sent from dev and staging environment, without spamming real customers.

Tools to test and monitor TLS eMail (Secure SMTP).

The Microsoft Support home page is your support portal for Microsoft products. Download updates and find top issues, error messages, and troubleshooting tips for Windows XP, Windows Vista, Windows 7, Office 2010, the 2007 Microsoft Office system, and...

AboutMyX provides services for network administrators and web masters. Services include free monitoring for server uptime, web spell checker, backup and restore tool using rsync and syslog viewer for PIX firewall.