What is DelegateAuth ?

2007-05-16 06:00:19,891 INFO [http-7071-Processor50] [ip=127.0.0.1;name=zimbra;] security - cmd=DelegateAuth; accountId=<accountidgoeshere>; accountName=user@domain.com;

The user is not an administrator, so should I be concerned that there is something port 7071 for them?