Ok, I've had a look at this and I see what you mean. All the other channels seem to include who posted the message, but for tells it is not the case.
Here is the table dump of a random global message args:
Code:
{
["Message"] = [globallff] Wyaran: 'wts [Relic Removal Scroll] pst'
["Sender"] = Narvelan
["ChatType"] = 28
}
In comparison to an IM message:
Code:
Scrarden tells you, 'tell'
{
["ChatType"] = 6
["Sender"] = Narvelan
["Message"] = tell
}
Sender always seems to be the character being played, though I've no idea why. Perhaps we can ask for this to be fixed at some point please?