本文详细介绍了如何通过telnet命令连接到指定的邮件服务器，并进行了ehlo命令的发送，验证了服务器的响应及身份认证信息。
appas4m@pewc05 $ telnet 158.118.18.232 25
Trying 158.118.18.232...
Connected to 158.118.18.232.
Escape character is '^]'.
220 server ready. Unauthorized Access Prohibited.
ehlo mail
250-pewc01.cn.pewg.panasonic.com Hello 158.118.18.120, pleased to meet you
250-8BITMIME
250-SIZE 10485760
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH PLAIN LOGIN
250-XAUTH
250 HELP
mail from:a@b.c
250 2.1.0 Sender OK
rcpt to:fengliuqing@cn.pewg.panasonic.com
250 2.1.5 Recipient ok
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