Send email

Hi,
I need to send an email from my program. How can I do this? I found this fucnction, but it gives me errors at compile time:

Code:

---

int MailIt (char *mailserver, char *emailto, char *emailfrom,
                        char *emailsubject, char *emailmessage)
{
        SOCKET sockfd;
    WSADATA wsaData;
    FILE *smtpfile;
   
    #define bufsize 300
    int bytes_sent;  /* Sock FD */
    int err;
    struct hostent *host;  /* info from gethostbyname */
    struct sockaddr_in dest_addr;  /* Host Address */
    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;  /* AF_INET from gethostbyname */
        dest_addr.sin_port= htons(25); /* PORT defined above */

        /* Get socket */

        if ((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0)
        {
                perror("socket");
                exit(1);
        }
        /* Connect !*/
        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
}

---

If someone can help me fix this out I'd be very thankful, the problem is I don't know much about Windows API, I can only use ready functions.

Fixed.

Code:

---

int MailIt(char *mailserver, char *emailto, char *emailfrom,
          char *emailsubject, char *emailmessage)
{
        SOCKET sockfd;
    WSADATA wsaData;
    FILE *smtpfile;
   
    #define waittime 1000
    #define bufsize 300
    int bytes_sent;  /* Sock FD */
    int err;
    struct hostent *host;  /* info from gethostbyname */
    struct sockaddr_in dest_addr;  /* Host Address */
    char line[1000];
    char *Rec_Buf = (char*) malloc(bufsize+1);
    smtpfile=fopen("SMTPLog.txt","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;  /* AF_INET from gethostbyname */
        dest_addr.sin_port= htons(25); /* PORT defined above */

        /* Get socket */

        if ((sockfd=socket(AF_INET,SOCK_STREAM,0)) < 0)
        {
                perror("socket");
                exit(1);
        }
        /* Connect !*/
        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
}

---

Thank you but I still don't know what files I need to include. When I include winsock.h it gives me some kind of long warning that there might be an error at runtime.
And if I'm using Gmail, what mailserver do I use?

OK I'm assuming the warning above isn't a problem. I tried smtp.gmail.com as a server but the message wasn't sent. Here's the log:

Code:

---

Connecting....
220 mx.google.com ESMTP y37sm15892923iky.7
helo me.somepalace.com
250 mx.google.com at your service
MAIL FROM:<from@gmail.com>
530 5.7.0 Must issue a STARTTLS command first y37sm15892923iky.7
RCPT TO:<to@gmail.com>
530 5.7.0 Must issue a STARTTLS command first y37sm15892923iky.7
DATA
530 5.7.0 Must issue a STARTTLS command first y37sm15892923iky.7
To:to@gmail.com
From:from@gmail.com
Subject:
This is a test
.
502 5.5.1 Unrecognized command y37sm15892923iky.7
502 5.5.1 Unrecognized command y37sm15892923iky.7
502 5.5.1 Unrecognized command y37sm15892923iky.7
502 5.5.1 Unrecognized command y37sm15892923iky.7
quit
502 5.5.1 Unrecognized command y37sm15892923iky.7
554 5.7.0 Too Many Unauthenticated commands. y37sm15892923iky.7

---

NOTE: I changed the emails for privacy ;)

Goto http://www.rfc-editor.org
Search for SMTP (RFC821 for example)
Do far more with the responses than simply dumping them in a file.

Most mail relays require you to authenticate in some way. Those that aren't are loved by spammers, and so are either very busy or very soon on everyone's blacklists.