What is SMTP ? A protocol to allow mail servers to exchange messages with each other. What is telnet ? Telnet is a user command and an underlying TCP/IP protocol for accessing remote computers mail specification that i use: ii  sendmail                              8.14.2-2build1                        powerful, efficient, and scalable Mail Trans ii  sendmail-base                         8.14.2-2build1                        powerful, efficient, and scalable … Continue reading How to send SMTP email using telnet