BusinessMail Email Server + Anti Spam System   
http://www.netcplus.com

BusinessMail 4 is a powerful Intranet/Internet email server and anti-spam system designed specifically for the business environment. It can be installed on any W95/W98//ME/W2K/XP or NT4 PC, and does not require a dedicated PC for smaller installations. BusinessMail 4 offers single/multiple email domain support, a web mail interface, web based configuration, fully user configurable "score based' anti-spam system, user & domain aliasing, powerful routing/filtering, flexible connection scheduling, remote administration via simple emails, support for permanent connections such as ADSL, cable and others, and of course all types of dial-up connections, automatic SMTP mail collection (if you have a permanent Internet connection and an MX record) and also via POP3 from multiple pop3 mailboxes. BusinessMail 4 can even send mail directly to internet recipients without an SMTP relay (using MX records), making it perfect for DSL, RoadRunner and other permanent connection users that are hosting their own Internet domains. BusinessMail 4 provides support for user configurable ports to allow it to connect across your network via internal or external routers, cable modems, dial-up systems or T1/T3 connections. A 2 mailbox system is only $62, a complete 5 user BusinessMail 4 email server system is $322, and more mailboxes can be added for a small incremental cost.

QK SMTP Server   
http://www.qksoft.com

QK SMTP Server is a powerful but easy-to-use smtp server software, which can send mails from localhost to the recipients' mailboxes directly at an amazingly high speed. Arrived or not, you will get a feedback instantly. QK SMTP Server can work with most mail client software, such as Outlook Express, Eudora, IncrediMail, the Bat!, Mutt, KMail, Pegasus, DevMail, Mail Bomber, Delta Mail, Foxmail; It can send mails at an amazing high spead with multithreads technology, even large amount of mails or newsletters. QK SMTP Server has three modes to send emails:Send directly to recipients' mail boxes;Send via a transit SMTP Server;Send directly first; if it failed, relay to transit SMTP Server. you can select one according your personal condition. Qk SMTP Server boasts a very easy-to-use interface,You don't need to bother with advanced techincal settings. The concise interface and on-hand HELP even can make a new hand to use it freely. While advanced users can control the process as they like in the configuration panel. QK SMTP Server supports SMTP Authentication before sending emails. Therefore you can kick off those anonymous users who are going to abuse your computer. http://www.qksoft.com/qk-smtp-server/

RevilloC MailServer   
http://www.revilloc.com

Send and collect all the emails for your home or office network, whilst saving dial up time. The mail server now contains a web proxy server, so you can now view internet web pages from your networked machines. The mailserver is designed to collect all your emails in one dial up connection. This will save your on-line time and telephone charges for not having each individual email client on your network collecting their own email. You can now collect all emails from multiple POP servers. The mail server will work as a standalone server on a shared PC or as a network mailserver. Now there is no longer a need for each user to dial up to collect their email. This mail server is a fully featured SMTP and POP3 server with unlimited connections or accounts, with ease of use being a priority. It has a scheduled send and receive, with a program override to allow outgoing email to be sent immediately and manual override from the mailbox tray icon.

Complete Mail Server   
http://www.softfolder.com

Complete Mail Server is high-performance professional SMTP/POP3 server software engineered for corporations and ISPs to satisfy business needs in ultra fast, flexible and reliable mail server. It works along with any email program or mailer and offers a lot of security features and options to allow you to protect the server from the outside and restrict the SPAM activity. In case of parallel mail processing, Complete Mail Server can be installed on several computers while the common message queue and user mailboxes can be kept on separate dedicated computers. You can assign specific configuration for each installation to facilitate email messaging in your organization. Friendly user interface of the program can be installed separately from the SMTP and POP3 services to give you ability to manage each of the server installations from a single PC. The SMTP and POP3 services can work as NT services and will keep working in the logoff mode. The special test mode is provided for software debugging and testing purposes that you can use to check if your email clients work properly. While test mode is activated, the server accepts your email messages, stores them in the queue but nothing delivers to the actual recipients. For example, this feature can be useful for developers to debug the scripts written with PHP, Perl, Java or other software. The SMTP Gateway Servers is another significant feature that makes Complete Mail Server just perfect for personal usage especially for the laptop PC users who have to change Internet Service Providers (ISP) while traveling around the world. Simply add all your SMTP servers that you use in different places to the unlimited list of gateway servers and the program will always find a correct SMTP server wherever you connect your PC to the Internet with any type of connection; so you do not have to modify SMTP settings of your email program each time you change ISPs.

The Email Server   
http://www.theemailserver.com

This program allows you to send internet mail directly from a Windows PC to its destination on the internet, and it will also accept email from other servers for you. You can use any standard email program to read and write messages, like Microsoft Outlook Express. If you have a PC network, all the PC's can send and receive email through the server with a single internet dial-up connection