We’ll be using telnet to connect to a mail server and send ourselves an email.
The parts in bold are the commands to enter.
[bob@linux ~]$ telnet mail.website.com 25 Trying mail.website.com... Connected to mail.website.com. Escape character is '^]'. 220-mail.website.com ESMTP Exim 4.85 #2 Mon, 09 May 2022 22:12:59 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. HELO domainto.sendfrom.com 250 mail.website.com Hello domainto.sendfrom.com [192.168.1.2] MAIL FROM: <firstname.lastname@example.org> 250 OK RCPT TO: <email@example.com> 250 Accepted DATA 354 Enter message, ending with "." on a line by itself Subject: Test Message This is a test . 250 OK id=5a1g7i-1347MT-1p QUIT 221 mail.website.com closing connection Connection closed by foreign host.
Further links to read