[otrs] How to close lots of tickets

Hi, In the process of my testing, I've run into a stale MX record which resulted in 800 new tickets created, from MAILER-DAEMON with subject "Warning: could not send messaage.. etc. etc". I want to select them all and close them all. How can I do this? From the queue view, I can only see 15 msgs at once (I presume I can change this in the config somewhere, but haven't looked yet) and I don't see a way to "select all". I tried clicking on each box on the page to do bulk action but I get a very annoying dialog box telling me I've selected the check box for each one I click - this should be turned off, IMHO. Ideally, I'd like to do a search and close all tickets returned from the search. Can this be done? Thanks, R.