SMTP Client Program

Table of Contents

• 1. A Visual C++ Project
• 2. smtp.cpp

1. A Visual C++ Project

Create a Project (Application) in Visual C++ (we have used MSVC 4.0)

Files in the Project:

• smtp.cpp
• wsock32.lib

2. smtp.cpp

#include <windows.h>
#include <winsock.h>
#include <stdio.h>

void abc(char *p)
{
  FILE *fp=fopen("z.txt","a+");
  fprintf(fp,"%s\n",p);
  fclose(fp);
}

struct sockaddr_in A;
WSADATA W;
SOCKET S;
char aa[100];
int i;
struct hostent *H;
char R[10000];

int _stdcall WinMain(HINSTANCE ii, HINSTANCE j, char *k, int l)
{
  WSAStartup (0x101, &amp;W);
  S = socket(AF_INET, SOCK_STREAM,0);
  A.sin_family=AF_INET;
  A.sin_port = htons(25);
  H=gethostbyname("giasbm01.vsnl.net.in");
  A.sin_addr.s_addr=*((unsigned long *) H->h_addr);
  i=connect(S,(struct sockaddr *) &amp;A,sizeof(A));
  sprintf(aa,"connect %d",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"HELO vijay.com\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"MAIL FROM:<vijay1@giasbm01.vsnl.net.in>\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"RCPT  TO:<ravi@giasbm01.vsnl.net.in>\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"DATA\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strcpy(R,"To: aaa.com\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"FROM: vijay1@giasbm01.vsnl.net.in\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"DATE: 10 Jan 95 13:24 PST\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"MESSAGE_ID: <123@e.com>\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"Hello\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"How are you\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  strcpy(R,".\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  strset(aa,' ');
  strcpy(R,"QUIT\r\n");
  i=send(S,R,strlen(R),0);
  sprintf(aa,"send %d ",i);
  abc(aa);
  strset(aa,' ');
  i=recv(S,R,10000,0);
  sprintf(aa,"recv %d R %s",i,R);
  abc(aa);
  return 0;
}

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Vijay Mukhi's Computer Institute
VMCI, B-13, Everest Building, Tardeo, Bombay 400 034, India
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