When configuring security in Hudson, I would like to use email addresses as
usernames. However, although it is possible to signup using a username that has
dots in it, the security settings do not work.

After adding a user with dots in their name the permission elements in
config.xml are not correct. The user is recorded using only the final part of
the username. For example, a user with username of john.doe@example.org would
be recorded in config.xml as:

<permission>hudson.model.Hudson.Administer:org</permission>

If I edit config.xml manually to put the full email address in it works correctly.