Snappymail cannot login to admin

Hi,
Have installed snappymail. Can access snappymail and login with email. But I am not able to login to admin like webmail.xxx.xx/?admin_7568d74b.
Username: admin_7568d74b
Password: 0TW3dDeV4zFalqfS
Secret key: admin_7568d74b
It say authentication failed.
What to do?

password is stored in /etc/snappymail/data/data/default/admin_password.txt, then goto the webmail.domain.com/?admin and use admin as the username

Thanks it worked. Saw an answer in the forum that it was the root folder and file .snappymail. What is not it,