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POPmail was an early e-mail client written at the University of Minnesota. The original version was a Hypercard stack that acted as a Post Office Protocol client. Later versions of POPmail were written as normal Macintosh applications, and a PC version of POPmail was also released. POPmail and Eudora were both instrumental in moving higher education e-mail use away from terminal-based user interfaces and into a client server/GUI metaphor.