POP was designed to accomodate environments where local users on PCs, Macs, or workstations either didn't desire to or could not afford to run SMTP compatible servers on their individual machines. There is NO logon onto the HP3000 involved, nor does the client even nee d to be aware that the HP3000 is actually storing their electronic mail til they retriev e it. Local message composition, dis tribution lists, and binary file attachment are common. POP server processes are managed by the background job and incur minimal CPU impact on the host. You are free to choose any POP2 or POP3 compliant client you wish.
Excellent examples are available both as public domain packages and as commercial packages.