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在外网如何登录Cmail邮箱

家青果教育科技有限公司的头像家青果教育科技有限公司 • 高考 •

在外网如何登录Cmail邮箱相关话题近期引发广泛关注，我们特别整理了多维度信息，希望能为您提供有价值的参考。

在公司路由上设置"转发规则“。

另外，请确定公司授权让你公开公司的内部网络。要不然，很容易受到攻击，且造成资料泄密。

鉴于你对于这个问题也不是特别清楚，所以请详细了解一下内外网的知识。

只能说主要代码，程序是一个整体，如果要直接编译通过，那就要整个发了

你自己改下吧

int CMail::sendmail()

{

int crecv;

if(smtplogin()==0)

{

return 0;

}

//发送mail from 返回250

sprintf(m_sendbuff,"%s%s%s","mail from:<",m_user,"@163.com>\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"250",3)!=NULL)

{

m_error=MAIL_FROM_ERROR;

return 0;

}

//发送rcpt to 返回250

sprintf(m_sendbuff,"%s%s%s","rcpt to:<",m_rcptto,">\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"250",3)!=NULL)

{

m_error=RCPT_TO_ERROR;

return 0;

}

//发送data\r\n 返回354

sprintf(m_sendbuff,"%s","data\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"354",3)!=NULL)

{

m_error=DATA_ERROR;

return 0;

}

//信头

if(!SetMailHeader(m_sendbuff))

{

m_error=MAILHEADER_ERROR;

return 0;

}

if(senddata()==0)

{

return 0;

}

//发送空行

sprintf(m_sendbuff,"%s","\r\n\r\n");

if(senddata()==0)

{

return 0;

}

//发送邮件body

sprintf(m_sendbuff,"%s%s",m_data,"\r\n");

if(senddata()==0)

{

return 0;

}

if(m_attachment!=NULL)

{

char **pp;

for(pp=m_attachment;*pp!=0;pp++)

{

FILE* fp;

char *buf;

//准备发送附件，首先发送分界线,必须!

sprintf(m_sendbuff,"%s%s%s","--",BOUNDARY_TEXT,"\r\n");

if(senddata()==0)

{

return 0;

}

sprintf(m_sendbuff,"%s%s%s","Content-Type: application/x-msdownload; name=\"",strrchr(*pp,'\\')+1,"\"\r\n");

if(senddata()==0)

{

return 0;

}

sprintf(m_sendbuff,"%s","Content-Transfer-Encoding: base64\r\n");

if(senddata()==0)

{

return 0;

}

sprintf(m_sendbuff,"%s%s%s","Content-Disposition: attachment; filename=\"",strrchr(*pp,'\\')+1,"\"\r\n\r\n");

if(senddata()==0)

{

return 0;

}

//将文件base64编码后发送

fp=fopen(*pp,"rb");

if(fp==NULL)

{

m_error=OPEN_FILE_ERROR;

return 0;

}

buf=new char[BUFFERSIZE+1];

memset(buf,0,BUFFERSIZE+1);

int readcount=0;

while(!feof(fp))

{

readcount=fread(buf,1,BUFFERSIZE,fp);

if(readcount>0)

{

*(buf+readcount)='\0';

sprintf(m_sendbuff,"%s%s",base64(buf,ENCODE,readcount),"\r\n");

if(senddata()==0)

{

return 0;

}

memset(buf,0,BUFFERSIZE+1);

}

}

sprintf(m_sendbuff,"%s","\r\n");

if(senddata()==0)

{

return 0;

}

delete[] buf;

fclose(fp);

}

}

if(m_attachment!=NULL)

{

//附件发送完毕，发送分界线

sprintf(m_sendbuff,"%s%s%s","--",BOUNDARY_TEXT,"--\r\n");

if(senddata()==0)

{

return 0;

}

}

//发送.\r\n 结束 返回250

sprintf(m_sendbuff,"%s",".\r\n");

if(senddata()==0)

{

return 0;

}

crecv=recv(s,m_recvbuff,MAX_LENGTH,0);

if(strncmp(m_recvbuff,"250",3)!=NULL)

{

m_error=END_DATA_ERROR;

return 0;

}

else

{

showmessage(NULL,"邮件发送成功","",NULL);

}

//退出

sprintf(m_sendbuff,"%s","quit\r\n");

if(senddata()==0)

{

return 0;

}

if(closesocket(s)!=0)

{

m_error=CLOSE_SOCKET_ERROR;

return 0;

}

if(WSACleanup()!=0)

{

m_error=CLEANUP_WSA_ERROR;

return 0;

}

return 1;

}

int CMail::senddata()

{

int idx = 0;

int csend;

int count=strlen(m_sendbuff);

while(count>0)

{

if((csend=send(s,m_sendbuff+idx,count,0))==SOCKET_ERROR)

{

m_error =WSA_SEND_ERROR;

return 0;

}

if(csend==0)

{

break;

}

count-=csend;

idx+=csend;

}

return 1;

}

int CMail::recvdata()

{

int crecv;

crecv=recv(s,m_recvbuff,MAX_LENGTH,0);

if(crecv==SOCKET_ERROR)

{

m_error =WSA_RECV_ERROR;

return 0;

}

else if(crecv==0)

{

m_error=WSA_RECV_ERROR;

return 0;

}

else

{

}

return 1;

}

int CMail::chartoindex(char c)

{

if(c>=65&&c<=90)

{

c-=65;

}

else if(c>=97&&c<=122)

{

c-=71;

}

else if(c>=48&&c<=57)

{

c+=4;

}

else if(c==43)//'+'

{

c=62;

}

else if(c==47)//'/'

{

c=63;

}

else if(c==61)//'='

{

c=0;

}

else

{

m_error=DECODE_ERROR;

return 0;

}

return c;

}

bool CMail::SetMailHeader(char* header)

{

// "Date:","From:","To:",

// "Message-ID:","Subject:","MIME-Version:",

// "Content-Type:","X-Priority:",

// "X-Mailer:","X-CM-TRANSID:","X-CM-SenderInfo:",

// "X-Coremail-Antispam:","\r\n\r\n"

TCHAR szDate[500];

TCHAR sztTime[500];

// Date: <SP> <dd> <SP> <mon> <SP> <yy> <SP> <hh> ":" <mm> ":" <ss> <SP> <zone> <CRLF>

SYSTEMTIME st={0};

::GetSystemTime(&st);

::GetDateFormat(MAKELCID(0x0409,SORT_DEFAULT),0,&st,"ddd\',\' dd MMM yyyy",szDate,sizeof(szDate));

::GetTimeFormat(MAKELCID(0x0409,SORT_DEFAULT),TIME_FORCE24HOURFORMAT,&st,"HH\':\'mm\':\'ss",sztTime,sizeof(sztTime));

sprintf(header,"Date: %s %s\r\n", szDate, sztTime);

// From: <SP> <sender> <SP> "<" <sender-email> ">" <CRLF>

if(m_mailfrom!=NULL)

{

strcat(header,"From: ");

strcat(header," <");

strcat(header,m_mailfrom);

strcat(header, ">\r\n");

}

// X-Mailer: <SP> <xmailer-app> <CRLF>

if(m_xmailer!= NULL)

{

strcat(header,"X-Mailer: ");

strcat(header, m_xmailer);

strcat(header, "\r\n");

}

// X-Priority: <SP> <number> <CRLF>

switch(m_priority)

{

case XPRIORITY_HIGH:

strcat(header,"X-Priority: 2 (High)\r\n");

break;

case XPRIORITY_NORMAL:

strcat(header,"X-Priority: 3 (Normal)\r\n");

break;

case XPRIORITY_LOW:

strcat(header,"X-Priority: 4 (Low)\r\n");

break;

default:

strcat(header,"X-Priority: 3 (Normal)\r\n");

}

// To: <SP> <remote-user-mail> <CRLF>

if(m_rcptto!=NULL)

{

strcat(header,"To: ");

strcat(header, m_rcptto);

strcat(header, "\r\n");

}

// Subject: <SP> <subject-text> <CRLF>

if(m_subject!=NULL)

{

strcat(header, "Subject: ");

strcat(header, m_subject);

strcat(header, "\r\n");

}

// MIME-Version: <SP> 1.0 <CRLF>

strcat(header,"MIME-Version: 1.0\r\n");

//attachment

if(m_attachment==NULL)

{ //如果没附件

strcat(header,"Content-type: text/plain; charset=GB2312\r\n");

strcat(header,"Content-Transfer-Encoding: 7bit\r\n");

strcat(header,"\r\n");

}

else

{ //如果有附件，设置分界线,每个子段以--BOUNDARY_TEXT行开始，父段则以--BOUNDARY_TEXT--行结束，不同段之间用空行分隔

strcat(header,"Content-Type: multipart/mixed; boundary=\"");

strcat(header,BOUNDARY_TEXT);

strcat(header,"\"\r\n");

strcat(header,"\r\n");//这个空行不能少

//第一部分为文本内容

strcat(header,"--");strcat(header,BOUNDARY_TEXT);strcat(header,"\r\n");//加上分界线

//以下跟没附件时的一样

strcat(header,"Content-type: text/plain; charset=GB2312\r\n");//注意GB2312 否则会出现中文乱码

strcat(header,"Content-Transfer-Encoding: 7bit\r\n");

}

// done

return true;

}

int CMail::senddata()

{

int idx = 0;

int csend;

int count=strlen(m_sendbuff);

while(count>0)

{

if((csend=send(s,m_sendbuff+idx,count,0))==SOCKET_ERROR)

{

m_error =WSA_SEND_ERROR;

return 0;

}

if(csend==0)

{

break;

}

count-=csend;

idx+=csend;

}

return 1;

}

int CMail::recvdata()

{

int crecv;

crecv=recv(s,m_recvbuff,MAX_LENGTH,0);

if(crecv==SOCKET_ERROR)

{

m_error =WSA_RECV_ERROR;

return 0;

}

else if(crecv==0)

{

m_error=WSA_RECV_ERROR;

return 0;

}

else

{

}

return 1;

}

int CMail::smtplogin()

{

//调用成员函数connect

if(connect()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strstr(m_recvbuff,"220")==NULL)//220

{

m_error=UNKNOWEN_ERROR;

return 0;

}

//发送helo 返回250

sprintf(m_sendbuff,"%s","helo 543880135\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"250",3)!=NULL)

{

m_error=HELO_ERROR;

return 0;

}

//发送auth login 返回334

sprintf(m_sendbuff,"%s","auth login\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"334",3)!=NULL)

{

m_error=AUTH_LOGIN_ERROR;

return 0;

}

//发送经过base64编码后的用户名，返回334

sprintf(m_sendbuff,"%s%s",base64(m_user,ENCODE,strlen(m_user)),"\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"334",3)!=NULL)

{

m_error=USER_ERROR;

return 0;

}

//发送经过base64编码后的密码 返回235

sprintf(m_sendbuff,"%s%s",base64(m_pass,ENCODE,strlen(m_pass)),"\r\n");

if(senddata()==0)

{

return 0;

}

if(recvdata()==0)

{

return 0;

}

if(strncmp(m_recvbuff,"235",3)!=NULL)

{

m_error=PASS_ERROR;

return 0;

}

return 1;

}

int CMail::connect()

{

WSADATA wsadata;

struct sockaddr_in sock_addr;

HOSTENT *phostent;

struct in_addr inaddr;

if(WSAStartup(MAKEWORD(1,1),&wsadata)<0)

{

m_error=WSA_INIT_ERROR;

return 0;

}

/*---------------根据域名获取网络地址，存放在struct in_addr中----------------*/

phostent=gethostbyname(m_server);//pop.163.com

if(phostent!=NULL)

{

// lpAddr=phostent->h_addr_list[0];

memmove(&inaddr,phostent->h_addr_list[0],4);//220.181.12.101

}

else

{

m_error=CONNECTSERVER_ERROR;

return 0;

}

/*---------------根据域名获取网络地址，存放在struct in_addr中----------------*/

s=socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);//SOCK_STREAM SOCK_DGRAM

sock_addr.sin_family=AF_INET;

sock_addr.sin_port=htons(m_port);

sock_addr.sin_addr=inaddr;//直接结构体赋值给结构体，或者写成：sock_addr.sin_addr.s_addr=inaddr.S_un.S_addr;

if(::connect(s,(struct sockaddr *)&sock_addr,sizeof(sock_addr)))

{

m_error=CONNECT_ERROR;

return 0;

}

return 1;

}

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  • 家青果教育科技有限公司的头像
    家青果教育科技有限公司 2026年04月20日

    我是「青果号]的签约作者“家青果教育科技有限公司”

  • 家青果教育科技有限公司
    家青果教育科技有限公司 2026年04月20日

    本文概览：在外网如何登录Cmail邮箱相关话题近期引发广泛关注，我们特别整理了多维度信息，希望能为您提供有价值的参考。在公司路由上设置"转发规则“。另外，请确定公司授权让你公开公司的内...

  • 家青果教育科技有限公司
    用户042009 2026年04月20日

    文章不错《在外网如何登录Cmail邮箱》内容很有帮助

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