[rt-users] Email address in use

[Eduardo Suarez-Santana]

I am autocreating users from apache client certificate authentication. 
Everyone in my organization can access the site.

However, there is a problem. Let's say John has never logged into RT. 
Then, he sends a mail to the system. An unprivileged account is created 
for him. Afterwards, he logs into the system and a privileged account is 
created.

But his email was already in the system, so his email is not associated 
with his account. If I try to change by hand, I get 'email address 
already in use'.

Is it possible to avoid this behaviour? Running RT-3.8.

Thanks in advance,
-Eduardo