Offers integration with older versions of AOL, Applelink, and Compuserve. OS 7 and 8 only; no longer maintained or supported. Includes free download.

List of e-mail clients for the Macintosh by MacOSArchives.com.

Offers integrated e-mail, address book, calendar, and newsgroup reader. Includes feature description, documentation, upgrade support, and trial download.

envelope v1.0 is a Macintosh application that adds single-click encryption to your Eudora email.

Offers e-mail access via any Java enabled browser. Includes feature description, online demo, and trial download.

Offers multi-lingual e-mail with right-to-left or left-to-right typing, spam filtering, HTML mail, SMTP authentication, auto-forwarding, and some AppleScript support. OS X and OS 9. Includes feature descriptions, FAQs, trial download, and upgrade option.

Offers support for POP, IMAP, and Web-based e-mail, multiple accounts, address book, server-side filtering, and new mail notification. For OS X 10.2 or higher, and OS 8 and 9. Includes feature list, screenshots, and trial download.

Barebones Software's mail client with wide variety of features for beginning and power users. For OSX and 9.

Offers POP and IMAP support, three-pane window mode, built-in spell checker, calendar, PGP compatibility, and auto-filing. OS X and OS 8.6 or higher. Includes documentation, mailing lists, FAQ, and trial download.

Offers multiple accounts and multi-user compatibility. OS 9 and earlier only. Includes free download.

Offers drag-send feature, global window, auto-send-attachment directory, and external word processor compatibility. OS X and OS 8.5 and higher. Includes feature description, support forum, screenshots, and trial download.

Offers newsgroup access, multiple accounts, and Exchange Server compatibility. OS 9 and earlier only; no longer maintained or supported. Includes free download.

Offers built-in spam filter and integration with SpamSieve, POP and IMAP support, customizable toolbars, AppleScript support, multiple filter rules, and SMTP authentication. OS X only. Includes feature descriptions, FAQ, testimonials, trial download, and sample AppleScripts.

Offers POP and IMAP support, SMTP authentication, filter rules, multiple accounts, and spam filter. For OS X and OS 9, as well as Windows XP. Includes documentation, support forums, and trial download.

Peer-to-peer messaging and chat utility offers file transfer between Windows and Mac computer, reminder messages, templates, return receipt request, and built-in spell checker. OS X and OS 9, as well as Windows. Includes documentation, FAQ, testimonials, and trial download.

Offers multiple accounts, address book, filters, templates, and multi-pane views. OSX and OS 9. Includes user guide, FAQ, and free download.