Horde does not allow me to erase e-mails ?

Hello forum, I'm not a programmer just a user with a website and a hosting service. I use HORDE as my e-mail manager and recently received a "your e-mail inbox is reaching full capacity" e-mail message, so I logged into horde to delete a few e-mail messages and it just won't allow me to do it. I checked the box to the left of the e-mail message(s) and press delete at the bottom and/or top buttons and nothing. Is this a BUG from Horde, or am I not following the proper procedures to delete e-mails. Help!!! thanks, Jorge

 

UID COPY failed: Message copy failed: Disk quota exceeded

HI, thank you for the tip, but I tried going back to the Mail account Maintenance and tried changing the quota for each e-mail address and I got this: " The e-mail account info@urbanauthentic.com was successfully modified. Write Failed: Disk Quota Exceeded" Should the company that is hosting my website actually allocate more memory for me ? or is it a function in Cpanel that I'm overlooking. One step closer though