Mailbox Verifier   
http://www.mailutilities.com

Mailbox Verifier (MV) is a small free software that will notify you about new messages arrived to your mailbox. The number of mailboxes MV can check is unlimited; it works with the POP3 protocol and can't deal with web-interface mailboxes and IMAP-servers. Besides, MV is very flexible and easy to configure. MV is familiar with many popular mail clients and never conflicts with them. You can check for new messages either manually or automatically with any time interval chosen. New message alert can be combined from blinking program icon in tray, sound alert and/or pop-up window as you like. MV is tactful enough to disable window pop-up while screen saver is running, and can hold back from attempting to check mail when there is no Internet connection.

Email Address Juggler   
http://www.mirage-avm.com

Email Address Juggler is a great program for sorting-out large numbers of email addresses. It's perfect for keeping your friends, customers or club members up to date. It has plenty of time-saving tools for loading, splitting and merging lists. If somebody decides they want out from a list, add them to the removals list to make sure that you don't bother them again. When you've got your list ready, use the built-in international spell-checker to check your message and then send it out with a click of the mouse. IMPORTANT: This is not spamming software. Juggler must never be used for sending offensive messages or unsolicited promotional material. The program contains features to help combat spammers!

Li'l MailChecker   
http://software.neuhaus13.com

With this program you can easily check your mailbox for special mails, e.g. from a friend, from your boss, favorite mailing partner or whoever. If such a mail comes in you will be notified about this by playing a sound and showing the mail. The advantage is that Li'L MailChecker is small and can run in background so it is not neccessary to run a big and resource wasting email-client (like Outlook) all the time.

Email Watcher   
http://www.pyxia.com

Email Watcher is an e-mail notification program that can check an unlimited number of POP3 email accounts. Events and filters can be applied to the incoming mail to play a wave file, Popup a message screen or delete the incoming mail. Events can be applied to individual accounts, all accounts or to a specific incoming message based on the criteria you select. Delete events are especially useful for deleting junk mail or potential viruses. When your computer is online, Email Watcher checks e-mail at intervals determined by you. When your computer is offline, Email Watcher can automatically dial up your ISP to check all of your e-mail. This feature can be disabled for LAN, DSL and CABLE modem users. New detail display shows all of the messages currently on the server and allows selective deletion without downloading the email.

Mail Snoop Pro   
http://www.rinnov.com

Mail Snoop Pro is an anti-spam and email notification application designed to monitor any number of mailboxes, finding and destroying spam without disturbing you and alerting you when there is new mail you need to see. The filter system rapidly checks new emails for any suspicious items. Beginning by checking if the sender is a "Friend", followed by checks for blacklisted senders, subject field, senders field, message header, message text, attachments and country codes. If an email is found to be spam, it will be archived for future reference and deleted from the server, alternatively it can be "bounced" back to the sender or used to generate an automatic complaint to the senders ISP. Feature Summary: Compatible with Pop3/IMAP4 servers. Supports multiple mailboxes. Powerful filter system. Mail Snoop Pro includes a powerful filter system to help block unwanted spam. A New Filter Wizard allows you to quickly add new filters as required and you can easily modify filters if needed. Friends list. You can add a list of friends email addresses allowing Mail Snoop Pro to always accept email from them. You are also able to import addresses from an external address book or file. Blacklist. There are some senders you just never want to hear from, add those individuals to the blacklist and Mail Snoop Pro will always delete their incoming mail. Message Archive. Whenever possible Mail Snoop Pro keeps a copy of deleted emails in its archive for later review/retrieval. Scheduled Mail Checks. Schedule automatic mail checks on a per-account basis or just check manually at any time. System Requirements: Windows 98/ME/NT4/2000/XP/2003. Internet Explorer V4.01 or later. Internet connection using either LAN/Cable/ADSL/DSL or dial-up modem. 7MB disc space. One or more Pop3/SSL Pop3/IMAP email accounts.