CheckMail   
http://www.desksoft.com

CheckMail is a powerful POP3 email checking program, which notifies you when you have received new email. It allows you to check all your email accounts for new messages and preview or delete them before downloading to your computer. CheckMail saves time and money by allowing you to delete unwanted or large emails directly from the server without downloading them. It supports custom notifications, multiple email accounts, sorting and filtering and much more. It is completely immune to viruses and other harmful email content, because it will never execute or start any attachments, scripts, programs, etc. For home offices or small businesses, CheckMail can act as a server by collecting and sending emails for many users. CheckMail is ideal for computers with permanent internet connection, because it can check for new emails at regular intervals. If you connect to the internet manually, CheckMail will ask you to connect whenever you want to check for new emails.

POP 'N' Check!   
http://www.dfg-crew.com

POP 'N' Check resides in the system tray, checking your mail on POP3 servers on given intervals. It tells you when you've got new mail! Yay!

Enterprise Mail Server   
http://www.emailarms.com

Enterprise Mail Server is a high-performance SMTP POP3 server program designed for large enterprises and Internet Service Providers where having an ultra fast and reliable mail server is vital. It can be used along with virtually any mailer or email program; it is simple, light-weight, powerful and absolutely bullet-proof. It has a lot of security features and options that allow you to protect the server from DDoS attacks as well as safely block SPAM and spammers. Another great feature is that Enterprise Mail Server can be installed on several computers while the common message queue and user mailboxes can be kept on separate dedicated PCs. This will definitely facilitate email messaging in your organization. The user interface of the program is flexible and can be installed separately from the SMTP and POP3 services. This will give you an ability to manage all your servers from a single PC where only the user interface of Enterprise Mail Server is installed. The SMTP and POP3 services work as NT services therefore they will keep working in the logoff mode. For software debugging and testing purposes, the program has a testing mode you can use to check if your email clients work correctly. After you enable the testing mode, the server will accept your email messages, store them in the queue but will not deliver them to the actual recipients. As a personal solution, it is ideal for laptop PC users who travel a lot and have to use different Internet Service Providers (ISP) on the run. Using Enterprise Mail Server, you will never encounter a sending problem wherever you connect your PC to a network or phone socket. If the program can not deliver your email message directly, it will try to deliver it through SMTP gateway servers. You can maintain an unlimited number of SMTP gateway servers to achieve the best delivery rate. Just add all your SMTP servers you use in different places to the list of gateway servers and the program will always use a correct SMTP server.

FTGate   
http://www.ftgate.com

FTGate4 is a powerful Windows mail server suite that combines exceptional mail handling facilities with comprehensive Groupware functionality. This fully featured and highly secure POP3/SMTP server suite is suitable for Win NT/2000/XP/2003 The new groupware corporate/personal information manager Solsight within FTGate4 gives full groupware access without the need for expensive Microsoft(TM) products. You can now have groupware with your favourite mail client. Features Include: Enhanced mail server functionality, Web Administration, Web Mail (English/German), SolSight PIM/CIM, Groupware Client, Shared Folders, (IMAP and WebMail), Shared Contacts , Shared Calendars , Shared Task lists, Instant Messaging, Instant Popups, Instant Notifications, Powerful Anti-spam, Anti-Virus support, Enhanced Security, Encryption (SSL/TLS), Free Migration Tool, Multiple domains, Mailing lists, POP3, LDAP, SPF (Sender Policy Framework), and much more.

IGetMail   
http://www.backup-for-workgroups.com

IGetMail is a Windows utility that automatically downloads e-mail messages from multiple remote servers, to a single, local e-mail server. IGetMail adds on to your local SMTP-compliant e-mail server to automate the downloading of e-mail from multiple remote servers. When you have a Microsoft Exchange Server, or a Eudora World Mail Server, or a UNIX based local e-mail server running, AND you are using an Internet Service Provider (ISP) to host your company's Internet domain, you will experience an e-mail routing problem. Your employees' e-mail messages are sent to the ISP's machine that is hosting your domain. These messages are stored on your ISP's server until you pull the messages down. IGetMail solves this e-mail routing problem for you. It automatically dials up the ISP, retrieves, and forwards e-mail messages to your local e-mail server. IGetMail runs according to a time schedule that you define, and it operates with just a regular modem and phone line. Now your e-mail server can complete its job and route your e-mail accordingly. IGetMail can download messages sent to multiple Internet domains. This is designed for companies that receive e-mail addressed to one or more domains. IGetMail downloads and sorts e-mail sent to "group" or Internet domain accounts, so your local e-mail server can distribute appropriately. IGetMail also supports downloading of messages from multiple individual accounts. This is designed to streamline your e-mail collection process when you have employees using accounts established with third-party e-mail suppliers.