例子 saka dlut. edu. cn# telnet mail. foo. com 25 frying192.168.1.4 Connected to here. foo. com Escape character is IA] 220 here. foo. com ESMTP Sendmail 8.8.8/8.8.8: Sat, 14 Mar199821:28:41-0500(EsT HELO ka. dlut. edu. cn 50 here. foo. com Hello root@ saka dlut. edu. cn [192.168.1.3], pleased to meet you MAILFROM:root@sakadlut.edu.cn 250root@sakadlut.edu.cn Sender ok RcptTo:hollingd@foo.com 250 hollings.. Recipient ok DATA 354 Enter mail end with on a line by itself Hi dave -this message is a test of SMTP 250 VAA07541 Message accepted for delivery8 saka.dlut.edu.cn# telnet mail.foo.com 25 例子 Trying 192.168.1.4... Connected to here.foo.com. Escape character is '^]'. 220 here.foo.com ESMTP Sendmail 8.8.8/8.8.8; Sat, 14 Mar 1998 21:28:41 -0500 (EST) HELO saka.dlut.edu.cn 250 here.foo.com Hello root@saka.dlut.edu.cn [192.168.1.3], pleased to meet you MAIL FROM: root@saka.dlut.edu.cn 250 root@saka.dlut.edu.cn... Sender ok RCPT TO: hollingd@foo.com 250 hollingd... Recipient ok DATA 354 Enter mail, end with "." on a line by itself Hi dave - this message is a test of SMTP . 250 VAA07541 Message accepted for delivery