Sometimes messages in Roundcube appear greyed out and won't open, usually after a server move or a mailbox becoming out of sync.
Try these steps
- Log out and back in, then clear your browser cache.
- In Roundcube, go to Settings › Folders, select the affected folder and click Rebuild or check that it's subscribed.
- Try another browser or a private/incognito window.
Repair the mailbox
In cPanel, open Email Accounts, click Manage beside the mailbox and look for an option to recalculate or repair disk usage.
If the problem continues, raise a ticket with the affected email address and we'll reindex the mailbox on the server.