POP3:

Short for "Post Office Protocol, Version 3" - A set of rules (protocol) by which a client machine can retrieve electronic mail from an email server. The POP server("post office") holds the e-mail until the user can retrieve it on their computer. POP3 does not provide for sending email, which can be done via SMTP or other method. POP3 can be used with or without SMTP, whereas the older POP2 standard requires SMTP to send messages.

Here is a list of Free Webspace with Free POP3 Email Service.