AnsiString sFile;
TIdAttachment *pAttachment;
sFile = "c:\\123.htm";
pAttachment = new TIdAttachment(IdMessage1->MessageParts,sFile);
IdMessage1->ContentType = "multipart/mixed";
IdMessage1->MessageParts->Add();
IdMessage1->MessageParts->Items[ 0 ] = pAttachment;
IdSMTP1->AuthenticationType=atLogin;
IdSMTP1->Port= 25 ;
IdSMTP1->Host="mail.infobox.ru";
IdSMTP1->UserId="vvv@link-service.ru";
IdSMTP1->Password="******";
IdMessage1->From->Text="vvv@link-service.ru";
IdMessage1->Recipients->EMailAddresses="vvv@link-service.ru";
IdMessage1->Subject="Subject";
IdMessage1->Body->Text="Test";
IdSMTP1->Connect();
IdSMTP1->Send(IdMessage1);
IdSMTP1->Disconnect();

IdMessage1->Body->LoadFromFile ("c:\\1.htm");