SMTP协议发送邮件问题

[你的OPPA]

问题1：多个收件人怎么一次性发送邮件？SMTP协议的对应格式又是怎么样的？
我一开始是通过多次发送，每次发送一个邮箱地址。

memset(m_cSendBuff,0,sizeof(m_cSendBuff));
    sprintf_s(m_cSendBuff,100000,"RCPT TO:<%s>\r\n",m_sMailInfo.m_pcReceiver);
    rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
    if(rt!=strlen(m_cSendBuff))
    {
        return false;
    }
    recv(sock,m_cReceiveBuff,1024,0);
	if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='0')
	{
		MessageBox(NULL, "收件人邮箱地址有误！", "警告", NULL);
		return false;
	}

问题2：抄送人的邮件该怎么发送？对应的SMTP协议格式怎么写？
求大神指点···

[你的OPPA]

第一个问题解决了，第二个问题怎么解决？

for (int i=0; i<10; i++)
    {
		OutputDebugString(m_sMailInfo.m_pcReceiver[i]);
		CString str = m_sMailInfo.m_pcReceiver[i];
		if (str.IsEmpty())
		{
			break;
		}
		memset(m_cSendBuff,0,sizeof(m_cSendBuff));
		sprintf_s(m_cSendBuff,100000,"RCPT TO:<%s>\r\n",m_sMailInfo.m_pcReceiver[i]);
		rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
		if(rt!=strlen(m_cSendBuff))
		{
			return false;
		}
    }
    recv(sock,m_cReceiveBuff,1024,0);
	if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='0')
	{
		MessageBox(NULL, "收件人邮箱地址有误！", "警告", NULL);
		return false;
	}

[fhw217]

字符串:

Cc: somebody <[e-mail]>, somebody2 <[e-mail]>

[fhw217]

sorry，我搞错了。 抄送也是 "RCPT TO: <%s>\r\n" 在邮件头加入字符串信息 "Cc: somebody <[e-mail]>, somebody2 <[e-mail]>，...\r\n"

[你的OPPA]

引用 2 楼 fhw_bin_dl 的回复:

字符串:

Cc: somebody <[e-mail]>, somebody2 <[e-mail]>

不对的，返回值为501

[fhw217]

Cc: somebody <[e-mail]>, somebody2 <[e-mail]>\r\n

把邮件换成你自己的，以回车换行符结尾。 这是一个例子: http://www.codeproject.com/Articles/28806/SMTP-Client

[你的OPPA]

引用 5 楼 fhw_bin_dl 的回复:

sorry，我搞错了。 抄送也是 "RCPT TO: <%s>\r\n" 在邮件头加入字符串信息 "Cc: somebody <[e-mail]>, somebody2 <[e-mail]>，...\r\n"

问题已经解决了：

for (int i=0; i<10; i++)
    {
		memset(m_cReceiveBuff, 0, 1024);
		CString str = m_sMailInfo.m_pcReceiver[i];
		if (str.IsEmpty())
		{
			break;
		}
		memset(m_cSendBuff,0,sizeof(m_cSendBuff));
		sprintf_s(m_cSendBuff,100000,"RCPT TO:<%s>\r\n",m_sMailInfo.m_pcReceiver[i]);
		rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
		if(rt!=strlen(m_cSendBuff))
		{
			return 0;
		}

		int nTemp = recv(sock,m_cReceiveBuff,1024,0);
		if (nTemp <= 0)
		{
			return 0;
		}
		if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='0')
		{
			CString eroStr = _T("收件人不存在！\r\n");
			CString erstr = m_sMailInfo.m_pcReceiver[i] + eroStr;
			strcpy(Name, erstr);
			return -1;
		}
    }

	//抄送人邮箱
	int m_CsNum = 0;
	for (int i=0; i<10; i++)
	{
		CString str = m_sMailInfo.m_ccReceiver[i];
		if (str == "")
		{
			break;
		}
		sprintf_s(m_cSendBuff, 100000, "RCPT TO:<%s>\r\n", m_sMailInfo.m_ccReceiver[i]);
		rt = send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
		if (rt!=strlen(m_cSendBuff))
		{
			return false;
		}
		m_CsNum ++;

		int nTemp = recv(sock,m_cReceiveBuff,1024,0);
		if (nTemp <= 0)
		{
			return false;
		}
		if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='0')
		{
			MessageBox(NULL, _T("抄送人邮箱地址有误！"), "警告", NULL);
			return false;
		}
	}
	
    memset(m_cSendBuff,0,sizeof(m_cSendBuff));
    memcpy(m_cSendBuff,"DATA\r\n",strlen("DATA\r\n"));
    rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
    if(rt!=strlen(m_cSendBuff))
    {
        return false;
    }
    recvNum = recv(sock,m_cReceiveBuff,1024,0);
	if (recvNum <= 0)
	{
		return false;
	}
	if(m_cReceiveBuff[0]!='3' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='4')
	{
		return false;
	}

    memset(m_cSendBuff,0,sizeof(m_cSendBuff));
    sprintf_s(m_cSendBuff,100000,"From:\"%s\"<%s>\r\n",m_sMailInfo.m_pcSenderName,m_sMailInfo.m_pcSender);
	for (int i=0; i<10; i++)
	{
		CString str = m_sMailInfo.m_pcReceiver[i];
		if (str == "")
		{
			break;
		}
		sprintf_s(&m_cSendBuff[strlen(m_cSendBuff)],1000,"To:<%s>\r\n",m_sMailInfo.m_pcReceiver[i]);
	}
	for (int i=0; i<10; i++)
	{
		CString str = m_sMailInfo.m_ccReceiver[i];
		if (str == "")
		{
			break;
		}
		sprintf_s(&m_cSendBuff[strlen(m_cSendBuff)],1000,"Cc:<%s>\r\n",m_sMailInfo.m_ccReceiver[i]);

	}
    sprintf_s(&m_cSendBuff[strlen(m_cSendBuff)],1000,"Subject:%s\r\nMime-Version: 1.0\r\nContent-Type: multipart/mixed;   boundary=\"INVT\"\r\n\r\n",m_sMailInfo.m_pcTitle);
    rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0);
    if(rt!=strlen(m_cSendBuff))
    {
        return false;
    }