[GeoNetwork-users] Problem self-registration/feedback-mails

Hi,

I have configured Geonetwork 3.0.1 on localhost:8080.
I set the geonetwork with the option to allow users to perform self-registration and added everything necessary in the "Feedback-Settings". But if someone wants to register,
he receives neither a mail nor the administrator's e-mail address.
In version 2.10.3 it worked without any problems. Has anything changed since the new version, has anybody the same problems, or are there already known bugs?

Thanks to any person who can help me!