When you installed the YouMail app, it created a YouMail group/account in your phone's address book. If you have the same contacts in Gmail, your phone, and YouMail, YouMail will show all of them.
You can hide or opt to not show your YouMail contacts in your phone's address book.
To resolve this problem on Android:
1. Open your Contacts
2. Select “Menu” and then Contacts to display
3. Deselect YouMail
If you are still having problems, please submit a ticket to our support team.