Acronym: Post Office Protocol 3
Protocol commonly used to receive E-Mail from a server, allowing the user to read mail locally, instead of logging in to the server via Telnet/SSH using an E-Mail client such as Pine to read mail. Port 110 is assigned by IANA for POP3. Some servers support POP3 over SSL. Port 995 is assigned by IANA for POP3S (POP3 over TLS/SSL).
- Telnet/Netcat - can be used to read mail if the user understands the basics of the POP3 protocol (pretty straightforward).
- Mutt - Mutt, try mutt -f pop://pop3.server
- Outlook - Outlook Express also does.
- A lot more, most known clients these days support POP3, though Webmail doesn't necesseraly do so.