DynAdvance Notifier 

Tired of checking all you email accounts many times a day to see if you have new email ? DynAdvance Notifier checks all your Hotmail, Gmail, Yahoo, POP3 or IMAP accounts for new email and automatically logs you into your webmail accounts !
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Catfood Mail 

Catfood Mail is a simple utility designed for administering POP3 mail boxes. It can be used to delete unwanted mail, preview the size of your mailbox before connecting your regular client over a slow connection, or as a lightweight email client.
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Pocket Email Checker 

Pocket Email Checker gives you full control over POP3 accounts when you are on the move, away from desktop PC's arsenal. It is easy to check accounts, preview messages and delete unwanted ones directly on a server before download.
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Internet Drummer! 

This program allows you to preview e-mails on multiple POP3 servers and delete unwanted messages before using e-mail client. It includes automatic spam filtering and serves as a notifier for both new e-mail arrivals and changes on specified web pages
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POP 'N' Check! 

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!
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Chilkat Mail.NET - Send Email with C# 

.NET SMTP / POP3 Email Component with S/MIME for signed and encrypted mail, attachments, HTML mail, Auto-Zip and Unzip attachments, XML import and export, SMTP authorization, Outlook integration, distribution lists, internationalized, mail-merge.
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