POPmail II is an early E-mail client for use with System 6 or System
7. While it does not offer as many features as other e-mail clients,
it's snappy even on considerable underpowered systems like e.g. the
Macintosh Classic and one of the best choices for E-Mail on System 6.

Requires a working [MacTCP][1] to work.

DL #1 contains v. 2.09

DL #2 contains v. 2.2, dated 1995

Compatibility
Architecture: 68k

Requires System 6.0.7, 1MB of RAM, 2MB for System 7

  [1]: http://macintoshgarden.org/apps/mactcp-206