关于邮件收发程序的问题

[xiopeter]

我用CSocket写了一个邮件收发程序，依次执行了smtp协议的helo,auth login,mail from,rcpt to命令之后，每次到达data的时候就会报出错误，我也不知道怎么会事情。那位牛人能不能告诉我一下到底发生了什么事情。

[Featured]

报什么错误？

[xuzheng318]

请楼主说得详细点！

[xiopeter]

有时侯它会说是not ready for data,有时候又报socket error，完全调试不了，我快崩溃了。

[xhzxlqt]

多半是没有认证,目前的SMTP服务器多半使用的是ESMTP协议,需要认证
下面是我发的一封邮件的全过程,S、C分别表示服务器端、客户端的响应：
S:220 Coremail SMTP(Anti Spam) System (163com[20050206])

C:EHLO VPRW5CA8AJI

S:250-smtp8
250-PIPELINING
250-AUTH LOGIN PLAIN NTLM
250-AUTH=LOGIN PLAIN NTLM
250 8BITMIME

C:AUTH LOGIN

S:334 VXNlcm5hbWU6 //Username:

C:c2FtcGxl

S:334 UGFzc3dvcmQ6 //Password:

C:c2FtcGxl

S:235 Authentication successful

C:MAIL FROM: <[e-mail]>

S:250 Ok

C:RCPT TO: <[e-mail]>

S:250 Ok

C:DATA

S:354 Send it

C:Message-ID: <002101c52c6c$68dde5b0$c71ea8c0@VPRW5CA8AJI>
From: "Mr.sample" <[e-mail]>
To: <[e-mail]>
Subject: sdfasdf
Date: Sat, 19 Mar 2005 18:04:34 +0800
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_001C_01C52CAE.1B6A4C50"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.2180
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180

This is a multi-part message in MIME format.

------=_NextPart_000_001C_01C52CAE.1B6A4C50
Content-Type: text/plain;
charset="gb2312"
Content-Transfer-Encoding: base64


------=_NextPart_000_001C_01C52CAE.1B6A4C50
Content-Type: text/html;
charset="gb2312"
Content-Transfer-Encoding: base64

PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv
L0VOIj4NCjxIVE1MPjxIRUFEPg0KPE1FVEEgaHR0cC1lcXVpdj1Db250ZW50LVR5cGUgY29udGVu
dD0idGV4dC9odG1sOyBjaGFyc2V0PWdiMjMxMiI+DQo8TUVUQSBjb250ZW50PSJNU0hUTUwgNi4w
MC4yOTAwLjI2MDQiIG5hbWU9R0VORVJBVE9SPg0KPFNUWUxFPjwvU1RZTEU+DQo8L0hFQUQ+DQo8
Qk9EWSBiZ0NvbG9yPSNmZmZmZmY+DQo8RElWPiZuYnNwOzwvRElWPjwvQk9EWT48L0hUTUw+DQo=

------=_NextPart_000_001C_01C52CAE.1B6A4C50--

C:
.

S:250 Ok: queued as FoCj64P7O0LaaikE.1

C:QUIT

S:221 Bye