In my server constantly password brute force attack smatermail default admin account.
Therefore I decide change user name ie admin to smart_admin. When I was change login detail and save the changes in Settings --> system Administrator get two system administrator name display with primary administrator rights, how to remove one entries
FYI - mailConfig.xml file do not have duplicate entries, Only GUI display two entries
If edit user name to change some other name get duplicate entries
Seems to be SM version 15 bug