Enjoy safe, fast and easy email, Mozilla-style! 
Mozilla Thunderbird is a fully featured, secure and very functional email client and RSS feed reader. It lets you handle mail efficiently and with style, and Mozilla Thunderbird filters away junk mail too. It offers a pretty and streamlined interface to a very powerful email package. Not only is Mozilla Thunderbird a secure email client, a sophisticated and very well integrated Bayesian spam filter knocks out most junk mail (after some training).
Combine these two aspects of Mozilla Thunderbird, and you get a sensible feature that automatically sanitizes (potentially dangerous) HTML code and turns off remote images for spam or anything else — worms, viruses — you classify as bad mail. Though not perfect, a scam sensor detects tactics commonly used to fool users.

Eudora provides easy to use email features plus the extra customization for the most advanced user. Eudora is the best email program for people who get lots of email. Easily sort and manage your mail, using multiple email accounts and a virtually unlimited number of mailboxes. Tracking your contacts is easy with immediate access to Internet directories and the personalized address book. Almost anything you can do including filing, forwarding, and trashing messages can be automated with filters, so you save time and stay on top of your work with minimal effort.
• Play your music for new mail and filters. Choose files from your downloaded music to use as the alert for new mail and filters. Get there via Tools > Options > Getting Attention! To add your music to Filters, go to Tools > Filters > Action > Playsound.
• SpamWatch: (Paid mode only) SpamWatch is a powerful tool in Eudora 6 and higher to help you stop Spam.

IncrediMail is an advanced e-mail client that offers you an unprecedented interactive experience. With IncrediMail you can personalize your e-mail according to your mood and personality. Unique multimedia features will enable you to tailor your email experience so that it fits your mood and personality. Visual effects will entertain your every sense. Choose from an assortment of e-mail backgrounds, animations, sounds, 3D effects, emoticons, dancing letters, random notifier selection, improved style box navigation, enahnced editing capabilities and e-cards and make them all become part of your e-mail. Features:
• Variety of backgrounds, animations and sounds
• Animated Emoticons to enliven your text
• Vibrant Incoming Email Notifications

Becky! is a multi-featured E-mail client specialized for Windows and the Internet.
Since its birth in 1996, we kept improving its functionalities listening to the users' feedback, and it has become one of the most successful shareware e-mail products.

Becky! Internet Mail is an email client that creates multiple mailboxes. You will find many features which are expected for an Internet E-mail software, and some of them would be beyond your expectations. It has almost every feature that are needed for e-mail client and has nothing that are only useful for the marketing hype. Its no-nonsense usability is widely supported by not only individual users but also large companies and schools, especially in Japan.

The Bat is an e-mail application that supports multiple POP3 accounts, true multithreading, MIME and UUencode standards, multimedia, message templates, minimization to the system tray, message notification, APOP authorization, and PGP. You also will find a fast and comfortable message editor with text highlighting, as well as a mail dispatcher for managing messages on servers. English, Russian, German, Dutch, Polish, Swedish, Italian, Lithuanian and Romanian interfaces are built in, as is a multilingual spelling checker. The application's other features include automatic dial-up networking (configurable for multiple accounts) and the option to include a photo with each address-book entry. There also are enhancements, such as message coloring, flagging, advanced filtering, speed improvements, and virus protection. The Bat! mail client has a lot of vital benefits and useful features that make your email experience simple and convenient. All these features perfectly fit any Windows OS.

End your spam nightmare and make email enjoyable again by keeping your Inbox free of annoying spam. Our intelligent spam filter for Works with Outlook, Outlook Express and Vista Mail analyzes email so effectively that in many cases it is more accurate than filtering by hand. Easy to use!
SpamBully is an anti-spam tool for Works with Outlook, Outlook Express and Vista Mail (or any other POP3 email program), that learns from spam messages and continually adjusts itself to protect your mailbox. It uses proactive rather than reactive methods for eliminating spam, and will actually keep 99% of spam out of your inbox in most cases. We tested it on our spam mailbox and it filtered 199 out of 200 spam messages that were downloaded. This is very impressive, considering that it does not require any kind of user configurations. If needed however, you can customize the filtering by maintaining an automatically generated Friends list and also add any senders to a block list with a single click.

MailWasher® Pro is the ultimate innovation in anti-spam software. Stop spam and unwanted email with MailWasher Pro. It's easy to use and very effective. Over 5 million downloads! Delete spam, viruses and other unwanted emails right at the server. Apart from being the most effective software to fight spam, you'll find that MailWasher® is probably the easiest anti-spam software to use.
MailWasher® Pro is an effective email management tool to get rid of spam and unwanted email. Easy to use and very effective, MailWasher® Pro allows you to preview and delete your unwanted email from an unlimited number of accounts in one simple step, before it reaches your inbox. Whether you have a POP3 account, MSN and Hotmail, IMAP or AOL; whether you are a home user or small business, MailWasher® Pro is right for you.

Enjoy safe, fast and easy email, Mozilla-style! Mozilla Thunderbird is a fully featured, secure and very functional email client and RSS feed reader. It lets you handle mail efficiently and with style, and Mozilla Thunderbird filters away junk mail too. It offers a pretty and streamlined interface to a very powerful email package. Not only is Mozilla Thunderbird a secure email client, a sophisticated and very well integrated Bayesian spam filter knocks out most junk mail (after some training). Combine these two aspects of Mozilla Thunderbird, and you get a sensible feature that automatically sanitizes (potentially dangerous) HTML code and turns off remote images for spam or anything else - worms, viruses - you classify as bad mail. Though not perfect, a scam sensor detects tactics commonly used to fool users. Flexible views, free-form tags and powerful filters, search and virtual folders (which also work fine with IMAP accounts and across email accounts) make it a snap to handle large amounts of mail.

Amazingly flexible email facility, with powerful searching, safe viewer and powerful filtering and scripting.
PocoMail gives you serious power over your email, from instant review of your folders via the unique Focus Box, to easy management of your contacts. You can automate email processing in a myriad of ways, from Filters and Events to easy-to-use PocoScripts. Instantly create AutoText snippets to use throughout the program, and subscribe to your favourite RSS feeds and Newsgroups to be read on demand or delivered with your email. All in a secure package that puts you in control.
PocoMail is easy to install, maintain and use, and yet does not sacrifice functionality. PocoMail makes email fun again while it saves you valuable time. Spending too much time on email? Spend quality time with your email program, not a quantity of time. Your daily email duties should be enjoyable, yet be kept short and productive.

YPOPs! is a free open source software that provides POP3 and SMTP access to Yahoo! Mail.
You can use your favourite email client, be it Outlook, Thunderbird, Netscape, Eudora, IncrediMail I or whatever else you like and connect to Yahoo! Mail seamlessly.

This application is more like a gateway. It provides a POP3 server interface at o­ne end to talk to email clients and an HTTP client (browser) interface at the other which allows it to talk to Yahoo! The same concept holds good for SMTP as well.
YPOPs! was started in May 2002 and over the years has a very large user community with over 3 million downloads.