IMAP Notify - Check all your IMAP e-mail accounts at once.

InboxRules RW Bundle Client Edition - Enhance the abilities of your mailbox.

InboxVault - Block unwanted e-mail advertisements and viruses.

InfoMail Editor - E-mail personalized HTML messages, brochures, catalogs, and newsletters.

IntelliMail - Send your personalized e-mails to multiple recipients.

Intellipeer Email Server - Integrate an enterprise-quality SMTP/POP3 e-mail server in your home or small office.

ISYS email.search - Search across thousands of e-mails fast and easily.

IzyMail Online - Access AOL, Yahoo, MSN, and Hotmail with any e-mail application.

Kinar KeepSafe FreeMail - Protect your information and distribute documents that can't be compromised by recipients.

K-ML - Manage any number of mailing lists.