Email is sent with this
protocol, as defined in RFC 821. SMTP has been assigned port 25. If someone knows this information, he or she can
use telnet to directly connect to any email server worldwide and send email.
The only tools necessary to do this are a telnet client program (included in
any operating system supporting TCP/IP,
which basically means all modern ones) and a recipientÂ’s email address. Email programs, text
editors, and browsers are not needed.
See Also:
Electronic Mail or Email; Port and Port Numbers; TCP/IP or Transmission Control
Protocol/Internet Protocol.
Dru. SMTP with telnet. [Online, 1999.] Daemon News Website. http://
www.daemonnews.org/199905/telnet.html.