[luisb]

Acá pongo otra forma... un poco mas compleja... yo la he usado varias veces... y me funciona independientemente del mailer que tenga configurado como por defecto...

function TForm1.SendEMail( Handle: THandle; Mail: TStrings): Cardinal;
type
TAttachAccessArray = array [0..0] of TMapiFileDesc;
PAttachAccessArray = ^TAttachAccessArray;
var
MapiMessage : TMapiMessage;
Receip : TMapiRecipDesc;
Attachments : PAttachAccessArray;
AttachCount : Integer;
i1 : integer;
FileName : string;
dwRet : Cardinal;
MAPI_Session : Cardinal;
WndList : Pointer;
begin
dwRet := MapiLogon(Handle, PChar(''), PChar(''), MAPI_LOGON_UI or MAPI_NEW_SESSION, 0, @MAPI_Session);

if (dwRet <> SUCCESS_SUCCESS) then
begin
MessageBox( Handle, PChar('Error al intentar mandar mensaje.'), PChar('Error'), MB_ICONERROR or MB_OK);
end
else
begin
FillChar(MapiMessage, SizeOf(MapiMessage), #0);
Attachments := nil;
FillChar(Receip, SizeOf(Receip), #0);

if Mail.Values['to'] <> '' then
begin
Receip.ulReserved := 0;
Receip.ulRecipClass := MAPI_TO;
Receip.lpszName := StrNew(PChar(Mail.Values['to']));
Receip.lpszAddress := StrNew(PChar('SMTP:' + Mail.Values['to']));
Receip.ulEIDSize := 0;
MapiMessage.nRecipCount := 1;
MapiMessage.lpRecips := @Receip;
end;

AttachCount := 0;

for i1 := 0 to MaxInt do
begin
if Mail.Values['attachment' + IntToStr(i1)] = '' then
break;
Inc(AttachCount);
end;

if AttachCount > 0 then
begin
GetMem(Attachments, SizeOf(TMapiFileDesc) * AttachCount);

for i1 := 0 to AttachCount - 1 do
begin
FileName := Mail.Values['attachment' + IntToStr(i1)];
Attachments[i1].ulReserved := 0;
Attachments[i1].flFlags := 0;
Attachments[i1].nPosition := ULONG($FFFFFFFF);
Attachments[i1].lpszPathName := StrNew(PChar(FileName));
Attachments[i1].lpszFileName := StrNew(PChar(ExtractFileName(FileName)));
Attachments[i1].lpFileType := nil;
end;
MapiMessage.nFileCount := AttachCount;
MapiMessage.lpFiles := @Attachments^;
end;

if Mail.Values['subject'] <> '' then MapiMessage.lpszSubject := StrNew(PChar(Mail.Values['subject']));
if Mail.Values['body'] <> '' then MapiMessage.lpszNoteText := StrNew(PChar(Mail.Values['body']));

WndList := DisableTaskWindows(0);
try
Result := MapiSendMail(MAPI_Session, Handle,
MapiMessage, MAPI_DIALOG, 0);
finally
EnableTaskWindows( WndList );
end;

for i1 := 0 to AttachCount - 1 do
begin
StrDispose(Attachments[i1].lpszPathName);
StrDispose(Attachments[i1].lpszFileName);
end;

if Assigned(MapiMessage.lpszSubject) then StrDispose(MapiMessage.lpszSubject);
if Assigned(MapiMessage.lpszNoteText) then StrDispose(MapiMessage.lpszNoteText);
if Assigned(Receip.lpszAddress) then StrDispose(Receip.lpszAddress);
if Assigned(Receip.lpszName) then StrDispose(Receip.lpszName);

MapiLogOff(MAPI_Session, Handle, 0, 0);
end;
end;