i've tried asking in AEC developer's forum as suggested.. but they say there must be no problem..truth is that since i use AEC.. no welcome mail nor private message are sent from autowelcome plugin!!
i used autowelcome plugin for many months and have been really satisfied by this addon.. please, can you help?
i'm actually using last version of CB and AEC, and joomla 1.0.12
don't tell that's because of this version! i've upgraded today!

and till yesterday it didn't work anyway with previous CB version 1.0.2 and AEC but it worked without AEC!!
thak you all