Ovidiu,
Here is the right module to mess with: http://openser.org/docs/modules/1.2.x/uac.html For now it can deal only with "From" header.
I had seen UAC but I really need to modify the To: field (I've been able to work around the From: field so far).
Hope this helps,
Sure! I think I'll try to modify UAC to add a function to modify To: and see how that goes. Thank you, Stéphane