Wormly has a few useful, simple, free tools to make your sysadmin life a bit easier. Including: Web server security scan, SMTP, POP3, FTP testing and Remote Ping.
You can run the following tests:
Test an HTTPS Secured Web Server - This free SSL / TLS web server testing tool conducts a thorough analysis of your SSL / TLS web server configuration and performance. Including protocols, encryption ciphers, known security weaknesses, session caching and much more.
Test an SMTP Mail Server - This free online tool allows you to test an SMTP mail server directly, sending a test email so you can be sure that it is functioning correctly. Perfect for setting up new mail exchangers (MX's) for your domain.
Test a POP3 Mail Server - This free online tool allows you to quickly test a POP3 mail server, so you can be sure that it is functioning correctly. Perfect when you're setting up a new mail server for your domain, plus it supports SSL.
Test an FTP Server - This free online tool allows you to remotely test an FTP server. Perfect for when your client is complaining that they can't connect to your FTP server!
Remote Ping - This free online tool allows you to remotely ping a server or other internet host. Perfect for testing if you are experiencing a localized routing problem.