Easy Network Service Monitor
Easy Service Monitor is a network fault management tool that continuously monitors network devices and services. If something went wrong, it will alert you by email/phone/pager BEFORE problems get seriously out of hand. A detailed log file will record every event of the monitored targets and can... You can configure the system so that when something goes wrong, a set of actions, such as execute a program, reboot server or update web page, will be triggered.
http://www.javvin.com/emonitor.exe - 2Mb - Download - Screenshot

GFI Network Server Monitor
GFI Network Server Monitor automatically monitors the network & servers for failures. It allows you to identify issues and fix unexpected conditions before your users (or managers) report them to you! Alerts can be sent by email, pager or SMS, for instant problem notification. ... GFI Network Server Monitor tests the status of a service by actually logging on, testing and logging off, rather than deducing a service status from generated events (as other products do), which is the only real way to ensure server uptime!
http://software.gfi.com/networkservermonitor7.exe - 13Mb - Download - Screenshot

EyeOnSite
EyeOnSite is a tool that keeps an eye on your sites or servers to see if they are accessible on the net. The services that can be monitored are http, ftp, smtp and pop3 . When a service goes down, you can choose to be alerted with a visual message or an audible alarm. ... Send an email message when a service goes on or comes off error. ... Individual log files and stats for each service monitored. ... Services supported: http, ftp, smtp, pop3. ... Set a different poll interval when a service goes on error.
http://virdi-software.com/eyeonsite/eosit170.zip - 791Kb - Download - Screenshot

A1Monitor Network Monitor TCP or Web
Monitor multiple web or TCP servers (http, https, ftp, pop3 etc. ) Receive email notification by email or pager if any can't server can't be reached a number of times in a row. A1Monitor can reboot your NT server or run a batch file or program for you. ... Reboot a local or remote computer when server failures occur. ... ) Support for http proxy server for http and https monitoring. ... Runs as an NT Service. ... exe when server failures occur. ... Email Notifications when servers go down and when they come back up.
http://files.a1tech.com/files/a1monitor.exe - 3Mb - Download - Screenshot

AA Mail Server
AA Mail Server is not only a standard SMTP/POP3 mail server, but also with the special and useful functionality of map mail server mode. Just as its name implies, map mail server will become a mirror of your ISP mail server and share your mail service. ... Email monitor You may need the function of email monitor which ISP mail server not provided. ... Other administrations Mail clear & backup, log analysis, multi-domains and domain alias and etc, which all ISP mail server cannot provide, will be other strong reasons for you to build your own mail server with AA Mail Server.
http://www.aa-mail-server.com/download/aa-mail-serversetup.exe - 1Mb - Download - Screenshot

smtp activex, smtp component, smtp control
A POP3 / SMTP email ActiveX component for sending and receiving email. Packed with advanced features including: full S/MIME capability for sending and receiving signed and encrypted email, MHTML for sending HTML email with embedded images and style sheets, multipart/alternative,...
http://www.chilkatsoft.com/ChilkatMail.exe - 2Mb - Download

Bello Network Monitoring WinGUI
Our on-demand monitoring service makes it easy and affordable to detect network and website failures early, minimizing downtime and avoiding economic impact. bello network monitoring service periodically checks your website as well as your other servers. ... Even if you run your own monitoring systems you might want to consider using our on-demand monitoring service as a "second opinion" about the availability of websites and their uptimes, e. ... when SLA (service level agreements) must be checked.
http://download2.paessler.com/download/bellowingui.zip - 1Mb - Download - Screenshot

ServersCheck STANDARD Edition
ServersCheck Standard Edition is a tool for monitoring, reporting and alerting on network and systems availability. The standard version can be used for free with up to 5 devices, which is adequate for personal use. It can monitor any TCP Port (HTTP, HTTPS, FTP, NNTP, POP3, SMTP, VNC, DNS, etc. ... ServersCheck runs as a local service and is administrated through a browser interface by connecting to the built-in web server. ... In addition, it also can monitor environmental devices like temperature, humidity, flooding.
http://serverscheck.swmirror.com/serverscheck_trial.zip - 10Mb - Download - Screenshot

ServiceKeeper
Benefits: Keeps your mission critical server applications running at all times· Prevents server crashes, avoiding expensive server downtime· Server failures are detected, recovered and notified quickly ensuring application availability without human intervention Integrates with Microsoft... Recovers failing critical applications using a variety of methods: Restart Services, Kill Service processes (No need to reboot), Start service on a different server (redundancy), Reboot servern Run custom programs/scripts or batch files, Clean up files (move, delete, copy etc.
http://www.activeplus.com/downloads/i386/skeeper.zip - 4Mb - Download - Screenshot

Chilkat SMTP / POP3 .NET Email Component
A POP3 / SMTP email . NET component for sending and receiving email. Packed with advanced features including: full S/MIME capability for sending and receiving signed and encrypted email, MHTML for sending HTML email with embedded images and style sheets, multipart/alternative, multipart/related,... NET, ASP. ... Works with C#, VB.
http://www.emailcomponent.com/ChilkatDotNet.msi - 2Mb - Download