an electronic mailbox where email can be delivered to

a place where email messages are held for you until you get around to "checking your email"

a place where email messages that have been received for you are stored before you get around to fetching them

a private secure storage location for your email that is accessed using an email program such as Outlook or Eudora

a private secure storage location for your email that is Performance Shopping Secure

a separate e-mail address with its own individual password

A POP mailbox is an actual mailbox at your domain name. More information is available. Contrast with a forwarding account

This is the equivalent of a post box at the post office. Using aliases you can link a number of e-mail addresses to a single mailbox so that all the mail sent to these addresses will land up in the same place. Alternatively, if you have a number of employees and each wants an independent, personal e-mail address you can assign each their own POP mailbox.