Redmine

I have configured my server to send reminder emails as explain here http://www.redmine.org/projects/redmine/wiki/RedmineReminderEmails

but I have noticed that users are receiving multiple duplicates emails. Each email has same content.

My issue already pointed out here http://www.redmine.org/issues/14251, but I didn't get any solution for this issue. I don't have any idea how to fix this issue.

Any help would be appreciated. Thanks.