TCP 110, 995: POP3(S)
In computing, the Post Office Protocol is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. POP version 3 is the version in common use.
-- Wikipedia
Related
General
Connect
nc -nv <ip> 110
or
telnet <ip> 110
USER user@<ip>
PASS password
List all emails
list
Retrieve email number 5, for example
retr 5
Guess users
nmap -sV --script=pop3-brute <ip>
nmap -p 110 --script pop3-brute --script-args userdb=<usernames-file>,passdb=<passwords-file> <ip>
Nmap scripts
pop3-brute.nse
pop3-capabilities.nse
pop3-ntlm-info.nse
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