NOT A VULNERABILY (Was port 25 vulnerability)

James Hammett james at CHE.UTEXAS.EDU
Fri Jan 30 16:12:13 GMT 2004

Telnet is just the name of the PROGRAM you are using to connect to a
SOCKET.  A socket is defined as an IP Address and a PORT.  It is used
to send TEXT over TCP/IP. The Telnet program can talk to any open
port, whether the program understands and responds, varies.

NORMALLY TELNET TALKS TO PORT 23.  The Telnet DAEMON listens on port
23.  It accepts incoming login sessions.

SMTP listens on Port 25.  It only accepts SMTP commands on port 25.
Popper listens on Port 110.

Other programs listen on other ports.  If you want to troubleshoot
POP or Sendmail, use telnet to connect to the appropriate port and
issue SMTP or POP3 commands to test the server. (I've done it
frequently.  Also you could read your email using telnet and
connecting to the Pop Daemon).


James Hammett
Users Services / Server and Lab Administration (SLAM)
Information Technology Services ( (ITS)                          CPE 4.442
Chemical Engineering Unix Support                                   471-9701
        An injustice anywhere is a threat to justice everywhere - MLK jr.

More information about the MailScanner mailing list