1
Hi:
Welcome registration email is sent not only to the newly registered user, but to the admins also (the name of the user in the body of the e-mail is changed appropriately, so "welcome newuser", "welcome admin", "welcome admin2"...).
It seems that "Notify by mail when a new user is registered?" must be enabled to reproduce the problem (I haven't tried setting "Select group to which new user notification mail will be sent" to "all users" and see if the duplicated welcome mails are sent to everyone registered).
May be
the same bug already reported in XOOPS 3.4 RC.
Regards: Colossus