OOps, sorry, mail was delayed!.
I've got the e-mail message notifying from the reply to apost through the send-copy-to-email setting from the Forum admin.
Everything is ok.
We'll, however, I remember here that in 1.8.4, the email received via watch or copy feature doesn't contain the link to the forum message URL (contains no URL at all).
I already reported this at sf.net bugs, but it seemed to be not important for the person who answered.
It could be nice to have this url in the "stable" Tiki version going on.
Thanks for your work,