# rpm -q evolution

whenever I move an email from one folder to another, a copy of that particular email also goes to the Trash folder

e.g I have an email in the folder "Inbox" , right click on that email > Move to folder... > and Select the folder "Customers"
done, that is that email moved from the "Inbox" to the "Customers" folder but another copy of that email is in "Trash" too ... why ?