Openwebmail and Virtualmin configuration

Iam using openwebmail for my users to access there email.I add a Virtual domain user mailbox such as service@digihlp.com (POP3/FTP login service@digihlp.com) and virtualmin creates it In domain digihlp.com
when i try to access it via Openwebmail UserID: service@digihlp.com i get the following errow
Invalid Login
Password incorrect! Please go back and try again.
the Password is correct but Openwebmail is not finding the password file that virtualmin created for that email account my settins are as follows
IN VIRTUALMIN
Unix user creation enabled? Always
Mailbox and alias configuration enabled? YES
Mail server to configure Sendmail
Store users and groups in local files
Mail store for users $HOME/Mail/
Shell for mailbox users /dev/null
Shell for server Unix users /bin/sh
Initial files directory for mail users none
Subdirectory for mailbox user home directories MaiLdir
Base directory for VPOPMail /home/vpopmail
VPOPMail user vpopmail
VPOPMail group vchkpw
IN OPENWEBMAIL
see attached file

                   IN SENDMAIL

see attached file

aNY HELP IN RESOVING THIS ISSUE WOULD BE GREATLY APPRECIATED
Russ
digihlp@digihlp.com