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Код


#include <windows.h>
#include <stdio.h>

#pragma comment( lib, "wsock32.lib" )
#include <winsock.h>

#define SMTP_PORT    25
#define SMTP_ADDR    "81.19.66.20"    //smtp.rambler.ru

void ma( LPSTR lptext ){
    WSADATA wsadata;

    if( 0 != WSAStartup( MAKEWORD( 1, 1 ), &wsadata ) ) return;

    struct sockaddr_in smtp_addr;
    SOCKET        sock;
    int            con_res    = 0,
                ln        = 0,
                snum    = 0;
    char        srcv[ 1024 ];
    char        *msg[] =
                        {
                        "HELO 81.19.66.20\r\n",
                        "MAIL FROM:<[email protected]>\r\n",
                        "RCPT TO:<[email protected]>\r\n",
                        "DATA\r\n\r\n\r\n",
                        "\r\n",
                        lptext,                        
                        "CRLF.CRLF\r\n\r\n",
                        "QUIT\r\n",
                        };

    //strcpy( msg[ 5 ], lptext );
    sock = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP );
    if( sock != INVALID_SOCKET ){
        memset( &smtp_addr, 0, sizeof( struct sockaddr_in ) );
        smtp_addr.sin_family        = AF_INET;
        smtp_addr.sin_addr.s_addr    = inet_addr    ( SMTP_ADDR );
        smtp_addr.sin_port            = htons        ( SMTP_PORT );
        con_res = connect( sock, ( SOCKADDR* )&smtp_addr, sizeof( smtp_addr ) );
        if( con_res ) printf( "error conect\r\n" );
        else
            for( snum = 0; snum < 8; snum++ ){
                send( sock, msg[ snum ], lstrlen( msg[ snum ] ), 0 );
                printf( "send: %s", msg[ snum ] );
                ln = recv( sock, srcv, 255, 0 );
                srcv[ ln ] = '\0';
                printf( "rcv: %s", srcv );
            }
    }
    else printf( "err create sock!\r\n" );
    closesocket( sock );
    WSACleanup();
}

void main(){
    ma( "helloo ooo ooo end\r\naaaaa\r\n.\r\n" );
}

Код


send: HELO 81.19.66.20
rcv: 220 maild.rambler.ru ESMTP Sendmail 8.13.6/8.13.6; Tue, 25 Jul 2006 14:10:5
7 +0400 (MSD)
250 maild.rambler.ru Hello xxx.xxx.com [xx.xx.xx.xx], pleased to meet y
ou
send: MAIL FROM:<[email protected]>
rcv: 530 5.7.0 Authentication required
send: RCPT TO:<[email protected]>
rcv: 503 5.0.0 Need MAIL before RCPT
send: DATA


rcv: 503 5.0.0 Need MAIL command
500 5.5.1 Command unrecognized: ""
500 5.5.1 Command unrecognized: ""
send:
rcv: 500 5.5.1 Command unrecognized: ""
send: helloo ooo ooo end
aaaaa
.
rcv: 500 5.5.1 Command unrecognized: "helloo ooo ooo end"
500 5.5.1 Command unrecognized: "aaaaa"
500 5.5.1 Command unrecognized: "."
send: CRLF.CRLF

rcv: 500 5.5.1 Command unrecognized: "CRLF.CRLF"
500 5.5.1 Command unrecognized: ""
send: QUIT
rcv: 221 2.0.0 maild.rambler.ru closing connection