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POPMail II v2.2 is an email client for earlier 68K Macintoshes.
POPmail_II_2.2.sit (202.81 KiB / 207.68 KB)
POPmail v2.2 / compressed w/ Stuffit
At least 1MB of free RAM under System 6 or 2MB of free RAM under System 7
Mac OS 4.x - Mac OS 9.2.2 (officially only supports 6.0.7 and higher tough)
Emulating this? It should run fine under: Basilisk II