Deleting emails in bulk

[#1]

How do I empty my plusnet mailboxes in bulk?
I'm talking 1000's not a few… Just want to clear ALL
Cheers 

[#2]

Are you using an email client or PlusNet's webmail?
If webmail, then to select all within a mailbox folder (including several pages if it goes into that many) you go down to the bottom of the mail list. There you will see some small icons next to the heading "Select:" if you click the first one that should allow you to delete all in that folder.