POP
Point of Presence, also Post Office Protocol , Two commonly used meanings: Point of Presence and Post Office Protocol.
A Point of Presence usually means a city or location where a network can be connected to, often with dial up phone lines. So if an Internet company says they will soon have a POP in Belgrade, it means that they will soon have a local phone number in Belgrade and/or a place where leased lines can connect to their network. A second meaning, Post Office Protocol refers to the way e-mail software such as Eudora gets mail from a mail server.
When you obtain a SLIP, PPP, or shell account you almost always get a POP account with it, and it is this POP account that you tell your e-mail software to use to get your mail.
A POP account is any real e-mail account which uses a password and username to retrieve mail from a virtual server.
The username would be [email protected] and the password would usually be a mixture of letters and numbers.