Webmail folder fatal error

[#1]

My sent folder in webmail is not loading. If I click on it I get the message "server error: Fatal error no such file or directory".
When I look at manage folders it is included with the special folders.
This has only been happening for a few days after years of working fine.
When I send a message from webmail I get the error " server error APPEND: cannot creaye message - no write permission or out of disk space"
I am not aware of being out of disk space.

Any ideas?

[#2]

Hi there.

I'm sorry to hear you're experiencing problems with your webmail service.

I can see you contacted one of my colleagues in our support team this morning and we've done some maintenance on your mailbox.

Are you still experiencing this issue?

[#3]

Hi,
Yes the problem is still there.
J

[#4]

Still no progress with this. Anyone any ideas?