eksemplet er her:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <windows.h>
#include <errno.h>
void mailsend(char *hostname,char *to,char * from,char *subj,char *body)
{
int sd,status,tmp;
char *buf,ownhost[100];
struct sockaddr local,remote;
struct hostent *hostinfo;
/* create socket */
sd=socket(AF_INET,SOCK_STREAM,0);
if(sd<0) {
printf("Error creating socket: %s\n",strerror(errno));
goto fin;
}
/* bind socket */
local.sa_family=AF_INET;
memset(local.sa_data,0,sizeof(local.sa_data));
status=bind(sd,&local,sizeof(local));
if(status<0) {
printf("Error binding socket: %s\n",strerror(errno));
goto fin;
}
/* lookup host */
hostinfo=gethostbyname(hostname);
if(!hostinfo) {
printf("Error looking up host: %s\n",hostname);
goto fin;
}
/* connect to host */
remote.sa_family=hostinfo->h_addrtype;
memcpy(remote.sa_data+2,hostinfo->h_addr_list[0],hostinfo->h_length);
*((short *)remote.sa_data)=25;
tmp=remote.sa_data[0];
remote.sa_data[0]=remote.sa_data[1];
remote.sa_data[1]=tmp;
status=connect(sd,&remote,sizeof(remote));
if(status!=0) {
printf("Error connecting to host: %s port: %d\n",hostname,25);
goto fin;
}
/* send email */
gethostname(ownhost,sizeof(ownhost));
buf = malloc(2000+strlen(body));
sprintf(buf,"HELO %s\r\n"
"MAIL FROM: <%s>\r\n"
"RCPT TO: <%s>\r\n"
"DATA\r\n"
"Return-Path: <%s>\r\n"
"From: %s\r\n"
"To: %s\r\n"
"Subject: %s\r\n"
"MIME-version: 1.0\r\n"
"Content-type: text/html; Charset=iso-8859-1\r\n"
"\r\n"
"%s\r\n"
".\r\n"
"QUIT\r\n",ownhost,from,to,from,from,to,subj,body);
status=send(sd,buf,strlen(buf),0);
if(status<0) {
printf("Error sending GET request\n");
goto fin;
}
free(buf);
fin:
closesocket(sd);
return;
}
int main(int argc,char *argv[])
{
WSADATA WSAData;
WSAStartup(0x0101,&WSAData);
mailsend("minmailserver", "dig@ditdomain.dk", "mig@mitdomain.dk", "Dette er en test", "<a href='
http://www.eksperten.dk/'>E</a>");
WSACleanup();
return 0;
}