ich wollte mir jetzt mehr wissen über sockets (speziell mailing) aneignen und hab auch ein mail tut gefunden:

------------------code--------
#include <winsock2.h>

#include <stdio.h>
#include <iostream>
using namespace std;
//#pragma comment(lib,"wsock32.lib")

#define EOL "\r\n"

DWORD smailid;
HANDLE hthr;
const WORD VERSION_MAJOR = 1;
const WORD VERSION_MINOR = 1;
int error;
char pszBody[1500];

typedef struct threadd
{
char name[200];
char fromid[200];
char toid[200];
char serv[200];
char sub[300];
char mes[1000];
} TDATA;

void send(char *smtpservr, char *fromname, char *fromid, char *toid,
char *subject, char *message);
void Check( int iStatus, char *szFunction );
DWORD WINAPI is_ok( LPVOID l);
int sendmail( LPVOID l);

int main()
{
/*
mail.web.de
mail.compuserve.com
ns2.cobaltservers.com
smtp.lycos.de

*/
send("mail.web.de","Absendername","mathias_kanzler@web.de","mathias_kanzler@web.de",
"Betreff","Nachricht");
getchar();
return 0;
}

void send(char *smtpservr, char *fromname, char *fromid, char *toid,
char *subject, char *message)
{
TDATA td;

strcpy(td.fromid,fromid);
strcpy(td.name ,fromname);
strcpy(td.serv ,smtpservr);
strcpy(td.toid ,toid);
strcpy(td.sub ,subject);
strcpy(td.mes ,message);
cout<<"Email an "<<toid<<" wird versendet . . ."<<endl;

hthr=CreateThread(NULL,0,is_ok,(LPVOID)&td,CREATE_SUSPENDED,&smailid);
SetThreadPriority( hthr, THREAD_PRIORITY_TIME_CRITICAL);
ResumeThread(hthr);
WaitForSingleObject(hthr, INFINITE);

}

DWORD WINAPI is_ok( LPVOID l)
{
TDATA *d=(TDATA *)l;
if(sendmail(l)==0)
cout<<"Versenden abgeschlossen"<<endl;
else
cout<<"Versenden gescheitert"<<endl;
return 0;
}


void Check( int iStatus, char *szFunction )
{
if (iStatus != SOCKET_ERROR && iStatus != 0) return;
else
error=1;
}

int sendmail( LPVOID l)
{
WSADATA WSData;
LPHOSTENT lpHostEntry;
LPSERVENT lpServEntry;
SOCKADDR_IN SockAddr;
SOCKET hServer;
int iProtocolPort;
char szSmtpServerName[100], szToAddr[100], szFromAddr[100];
char szBuffer[4096], szMsgLine[255];

TDATA *d=(TDATA *)l;
error=0;

lstrcpy( szSmtpServerName,d->serv );
lstrcpy( szToAddr, d->toid );
lstrcpy( szFromAddr,d->fromid );

if ( WSAStartup(MAKEWORD(VERSION_MAJOR, VERSION_MINOR), &WSData) )
{
cout<<"Error: Kann Winsock nicht finden"<<endl;
return(1);
}

lpHostEntry = gethostbyname( szSmtpServerName );
if (lpHostEntry == NULL)
{
cout<<"Error: Kann den SMTP Server("<<szSmtpServerName<<")"
<<"nicht finden "<<endl;
return(1);
}

hServer = socket( PF_INET, SOCK_STREAM, 0);
if (hServer == INVALID_SOCKET)
{
cout<<"Error: Cannot open mail server socket"<<endl;
return(1);
}

lpServEntry = getservbyname( "mail", 0);

if (lpServEntry == NULL)
iProtocolPort = htons(IPPORT_SMTP);
else
iProtocolPort = lpServEntry->s_port;

SockAddr.sin_family = AF_INET;
SockAddr.sin_port = iProtocolPort;
SockAddr.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);

if (connect( hServer, (PSOCKADDR) &SockAddr, sizeof(SockAddr)))
{
cout<<"Error: Connecting to Server socket failed"<<endl;
return (1);
}

Check( recv( hServer, szBuffer, sizeof(szBuffer), 0), "recv() Reply");

wsprintf(szMsgLine,"HELO %s%s","microsoft [111.122.1.12]", EOL);
Check(send(hServer,szMsgLine,strlen(szMsgLine), 0),"send() HELO");
Check(recv(hServer,szBuffer,sizeof(szBuffer), 0),"recv() HELO");

wsprintf( szMsgLine,"MAIL FROM:<%s>%s", szFromAddr,EOL);
Check(send(hServer,szMsgLine,strlen(szMsgLine), 0),"send() MAIL FROM");
Check(recv(hServer,szBuffer,sizeof(szBuffer), 0),"recv() MAIL FROM");

wsprintf( szMsgLine,"RCPT TO:<%s>%s", szToAddr, EOL);
Check(send(hServer,szMsgLine,strlen(szMsgLine),0),"send() RCPT TO");
Check(recv(hServer,szBuffer,sizeof(szBuffer),0),"recv() RCPT TO");

wsprintf( szMsgLine,"DATA%s", EOL);
Check(send(hServer,szMsgLine,strlen(szMsgLine),0),"send() DATA");
Check(recv(hServer,szBuffer,sizeof(szBuffer),0),"recv() DATA");


char sdate[70];
lstrcpy(sdate,"Date: ");
char s1s[70];
GetDateFormat(0x409,0,0,"ddd,dd MMM yyyy",s1s,200);
lstrcat(sdate,s1s);
lstrcat(sdate," ");
GetTimeFormat(0x409,0,0,"HH:mm:ss",s1s,200);
lstrcat(sdate,s1s);
lstrcat(sdate," PM");

char header[350];
lstrcpy(header,"From: ");
lstrcat(header,d->name );
lstrcat(header,"<");
lstrcat(header,d->fromid );
lstrcat(header,">");
lstrcat(header,"\r\n");
lstrcat(header,"To: ");
lstrcat(header,d->toid );
lstrcat(header,"\r\n");
lstrcat(header,"Subject: ");
lstrcat(header,d->sub );
lstrcat(header,"\r\n");
lstrcat(header,sdate);
lstrcat(header,"\r\n");
lstrcat(header,"X-Mailer: Outlook Express 1.00\r\nMIME-Version:
1.0\r\nContent-Type:text/plain;\r\n\tcharset=\"iso-8859-1\"
\r\nContent-Transfer-Encoding: 7bit\r\n\r\n");

wsprintf( szMsgLine,header);
Check(send(hServer,szMsgLine,strlen(szMsgLine), 0),"send() header");
if (error)
return error;

lstrcpy(pszBody,d->mes );
lstrcat(pszBody,"\r\n\r\n");
Check(send( hServer,pszBody, strlen(pszBody), 0), "send() message");
wsprintf(szMsgLine,"%s.%s", EOL, EOL);
Check(send(hServer,szMsgLine, strlen(szMsgLine),0),"send() end-message");
Check(recv(hServer,szBuffer, sizeof(szBuffer),0),"recv() end-message");
wsprintf(szMsgLine,"QUIT%s",EOL);
Check(send(hServer,szMsgLine,strlen(szMsgLine),0),"send() QUIT");
Check(recv(hServer,szBuffer,sizeof(szBuffer),0),"recv() QUIT");
closesocket(hServer);
WSACleanup();

return error;
}

--------------code ende--------------

ich bekomme die meldung, dass die mail versendet wurde, es kommt aber nix an!!

wo liegt das problem?

Wenn du die Sache lokal machst, sollte halt schon ein SMTP Server laufen, oder habe ich da was verpasst?

ich will die mail über den web server senden:

send("mail.web.de","Absendername","mathias_kanzler@web.de","mathias_kanzler@web.de",
"Betreff","Nachricht");

Kannst aber auch nicht einfach einen Webserver nehmen und dann was schicken! Wenn dann muss man sich authifizieren! (Sprich Benutzername & Passwort muss mit) Dazu bitte die RFC's lesen!

ich habs jetzt ohne authentifizierung geschafft
nur beim test hats leider einen zwischenfall gegeben... -> http://www.mogelpower.de/forum/thread.php?91176

wer trotzdem den code haben will und sorgsam damit umgeht, der solls sagen...