Shoutbox

I would guess that you could change the response packet from msn with the outgoing packet. If you sniff long enough you could probably find out what your msn sends to the server when it's "apearing offline" so that the other user gets the message that it might not be delivered.
And then send that packet instead of a "ok I got the message" one.

That would be my take on it anyway but no time available to even try.

Not really. The message that it wasn't delivered is sent to the sender by the Messenger server.

When you change your status to appear offline, Messenger just tells the server that you've signed out.

quote:

---

Originally posted by deAd
When you change your status to appear offline, Messenger just tells the server that you've signed out.

---

Wouldn't that mean that you stop receiving information from the server? It must tell the server that you're appearing offline and still want the information of your contact list... surely...

But even if you really are offline, the contact wouldn't receive the message, because then it's send as an offline message

I think it could be possible to fake the message, by sending an action message saying the message couldn't be delivered (But you'd have to know the language, or else he could notice)

My mistake, let me clarify. It doesn't send a signing out message. It sends that your status is changing to Offline, which is also sent before you sign out. However, without the signout messages, Messenger continues to receive contact list information and normal messages.

When you sign out, all that your contacts' clients see is the status changing message. Only the server knows if you're really offline.

quote:

---

Originally posted by Shondoit

I think it could be possible to fake the message, by sending an action message saying the message couldn't be delivered (But you'd have to know the language, or else he could notice)

---

This is exactly why if I could send an action message I would be able to fake it and make the recipient beleive that I didn't get the message, but I could still get a copy of it for light reading later if I so desire.

Action messages and Plus! colors would work fine, you'd also need that one icon as an emoticon, and to know if the contact had plus/what language (as said above).

However, if the person doesn't use plus they wont see the plus colour codes. If you can find a way of stopping the message being sent to the client, then the server will see it as not being delivered.

Cloudy

I doubt that, I don't think the client sends a verification message to the server to say it was received if it was or not is picked up by the server.

Hmm... Well how about sending the server a close message every time the session is opened? There have been instances when i've had to repeat a message, as it said it wasn't delivered because at the very same moment they had closed the window.

Cloudy