If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
That said, you should still be able to delete messages. Have you tried the usual way to tick the checkboxes for the e-mails you'd like to delete and then click on the "Delete" button at the top? Can you describe what happens when you do that? Is there an error message?