POP3 is the earlier, better-known email protocol. POP3 was designed to permit on-demand retrieval to a single client machine. Email is stored on the mail server until you retrieve it, at which time it is transferred over the network to your desktop machine and stored in your email box there. | POP3 is the earlier, better-known email protocol. POP3 was designed to permit on-demand retrieval to a single client machine. Email is stored on the mail server until you retrieve it, at which time it is transferred over the network to your desktop machine and stored in your email box there. |