This very likely not a bug. Either the user must edit his identity in 
preferences to include the proper email address or the system 
administrator must setup a hook to do so.

However you are right that it is inconvenient. We should have a 
concept of a "default domain" and an out of the box setup should set a 
user's prefs, if not otherwise defined, to that name.

Erreur: Une erreur est survenue lord de l'envoie du message: Addresse 
is missing domain.

Mon courriel d'envoie est simplement devenu "jokos@" au lieu de 
"jovan.kostenov@polymtl.ca" alors je n'arrive pas a envoyé de courriel