从Linux中的C/C++程序发送电子邮件

#include <stdio.h>
#include <@R_944_10495@ng.h>
#include <errno.h>
int sendmail(const char *to,const char *from,const char *subject,const char *messagE)
{
    int retval = -1;
    FILE *mailpipe = popen("/usr/lib/sendmail -t","w");
    if (mailpipe != NULL) {
        fprintf(mailpipe,"To: %s\n",to);
        fprintf(mailpipe,"From: %s\n",from);
        fprintf(mailpipe,"Subject: %s\n\n",subject);
        fwrite(message,1,strlen(messagE),mailpipE);
        fwrite(".\n",2,mailpipE);
        pclose(mailpipE);
        retval = 0;
     }
     else {
         perror("Failed to invoke sendmail");
     }
     return retval;
}

main(int argc,char** argv)
{
    int i;

    printf("argc = %d\n",argc);

    for (i = 0; i < argc; i++)
        printf("argv[%d] = \"%s\"\n",i,argv[i]);
    sendmail(argv[1],argv[2],argv[3],argv[4]);
}