#define cmailserver "gmail-smtp-in.l.google.com"
#define cemailto "me1@gmail.com"
#define cemailfrom "me2@gmail.com"
#define SMTPLog "SMTP log.txt"
#define cemailsubject "test"
#define waittime 30

int MailIt(char *mailserver, char *emailto, char *emailfrom,
           char *emailsubject, char *emailmessage, long maxlen)
{
	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[maxlen+100];
    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
}

cmd: TELNET smtp.gmail.com 25
// This clears out (comment)

S: 220 mx.google.com ESMTP 39sm1851524hui.5
C: ehlo
S: 250-mx.google.com at your service, [90.148.53.234]
    250-SIZE 28311552
    250-8BITTIME
    250-STARTTLS
    250 ENHANCEDSTATUSCODES
C: starttls
S: 220 2.0.0 Ready to start TLS
C: auth plain


Connection to host lost.