Overview
Generating a User Report for one email address (one user) for any time period takes a long time and eventually times out. Regular reports for all users are generated successfully.
Environment
GFI MailEssentials 2012 build 20120913.
Root Cause
A report for one user has more criteria to define than a site-wide report. As the query is more complicated, it takes more time to complete and eventually times out if the dataset is too large.
Resolution
Upgrade to GFI MailEssentials 2015 or later.