发送"DATA"后不是马上发送邮件内容,而是等待邮件服务器给客户端发送一个<br>"354",例<br>data<br>354 Start mail input;end with <CRLF>.<CRLF><br>TO:someone mail address<br>Form:your mail address<br>Date:Fri,12 Dec 2001 12:20:02 -0700<br>Message-ID:<省略><br><br>How are you<br>.<br>250 ok