C语言实现发送邮件功能

第C语言实现发送邮件功能sprintf(buff,"123456789");

//需要改成自己的密码，有的邮箱是需要填授权码不是登录用的密码

Base64Encod(buff,encbuff,strlen(buff),len);

memset(buff,0x00,sizeof(buff));

sprintf(buff,"%s\r\n",encbuff);

ret=server_send_recv_display(sock,buff);

if(ret0){

return-1;

}

return0;

//发送发件人

intemail_send_from_fun(intsock)

charbuff[320]={0};

intret;

sprintf(buff,"MAILFROM:xxxxxxxxxx@126.com\r\n");

ret=server_send_recv_display(sock,buff);

if(ret0){

return-1;

}

return0;

//发送收件人

intemail_send_to_fun(intsock)

charbuff[320]={0};

intret;

sprintf(buff,"RCPTTO:xxxxxx@163.com\r\n");

ret=server_send_recv_display(sock,buff);

if(ret0){

return-1;

}

return0;

//通知服务器准备发送邮件

intemail_send_ready_fun(intsock)

charbuff[320]={0};

intret;

sprintf(buff,"DATA\r\n");

ret=server_send_recv_display(sock,buff);

if(ret0){

return-1;

}

return0;

//发送邮件

intemail_send_maintext_fun(intsock)

charbuff[320]={0};

intret;

sprintf(buff,"From:\"pc\"xxxxxxxxxx@126.com\r\n"

//发件人

"To:\"con\"xxxxxx@163.com\r\n"

//收件人

"Subject:emailtest\r\n\r\n"

//主题

"test:\r\n"

//正文,以\r\n.\r\n结束

"

line1\r\n"

"

line2\r\n.\r\n");

ret=server_send_recv_display(sock,buff);

if(ret0){

return-1;

}

return0;

#defineMAX_BUFF_SIZE

512

intmain()

intsock;

charbuff[MAX_BUFF_SIZE];

WSADATAwsa;

intret;

if(WSAStartup(MAKEWORD(1,1),wsa)!=0){

printf("WSAstartupfailed\n");

return1;

}

sock=CreateSocketAndConnect();

if(sock0){

return-1;

}

printf("connecttoserversuccess\n");

memset(buff,0x00,sizeof(buff));

while(1){

ret=recv(sock,buff,MAX_BUFF_SIZE,0);

if(ret0){

printf("recverror\n");

continue;

}

printf("%s",buff);

break;

}

//1.sendhelo

if(email_send_helo_fun(sock)0){

return1;

}

//2.sendauthlogin

if(email_send_authlogin_fun(sock)0){

return1;

}

//3.sendusername

if(email_send_username_fun(sock)0){

return1;

}

//4.sendpassword

if(email_send_password_fun(sock)0){

return1;

}

//5.sendfrom

if(email_send_from_fun(sock)0){

return1;

}

//6.sendto

if(email_send_to_fun(sock)0){

return1;

}

//7.sendnoticeready

if(email_send_ready_fun(sock)0){

return1;

}

//8.sendema