Help - Permissions issue with new mail

Hi all.

We have an install of Dovecot running with Postfix and Roundcube using virtual mail to allow us to connect to our AD domain which got messed up after a power issue.

I can log into our Roundcube and see all my old emails, however new emails keep getting stuck in the CUR files with permissions of -rw-------

If I chmod the email it will deliver to the inbox in Roundcube.

Can anyone advise on how I can adjust this so all new emails will come thru with the correct permissions? - Thanks in advance