telnet测试smtp发信

怎么通过telnet测试smtp发信：
测试SMTP认证：
 通过perl命令获得[email protected]的用户名和密码的base64编码：
 # perl -e 'use MIME::Base64; print encode_base64("postmaster\@extmail.org")'
 cG9zdG1hc3RlckBleHRtYWlsLm9yZw==
 # perl -e 'use MIME::Base64; print encode_base64("extmail")'
 ZXh0bWFpbA==

 # telnet mail.extmail.org 25
Trying 192.168.1.252...
Connected to mail.extmail.org (192.168.1.252).
Escape character is '^]'.
220 mail.extmail.org ESMTP Postfix -uplooking
ehlo mail.extmail.org   //手动输入的：
250-mail.extmail.org
250-PIPELINING
250-SIZE 5242880
250-VRFY
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
auth login  //手动输入的
334 VXNlcm5hbWU6
cG9zdG1hc3RlckBleHRtYWlsLm9yZw==    //手动复制
334 UGFzc3dvcmQ6
ZXh0bWFpbA==  //手动复制的
235 2.7.0 Authentication successful
mail from:[email protected] //输入内容，注意此处test的base64编码一定与上面的认证信息对应！！！
250 2.1.0 Ok
rcpt to:[email protected] //输入内容，要给谁发信
250 2.1.5 Ok
data  //输入内容
354 End data with <CR><LF>.<CR><LF>
subject: this is the subject //主题，标题信息在这个地方写
xian zai shi zheng wen //正文信息
jieshu.
.
250 2.0.0 Ok: queued as B817A4BBF63
quit
221 2.0.0 Bye
Connection closed by foreign host.