using imapfilter

http://moiristo.wordpress.com/2008/11/18/sorting-imap-mail-with-imapfilter/

I struggled a bit to use imapfilter to delete the mails at the server.
The following was configuration

--------------
-- Options --
---------------

options.timeout = 120
options.subscribe = true


----------------
-- Accounts --
----------------

-- Connects to "imap1.mail.server", as user "user1" with "secret1" as
-- password.
account1 = IMAP {
server = 'myserver.com',
port = 993,
username = 'username',
password = 'password.',
ssl = 'tls1',
}

results = account1.INBOX:contain_subject('Subject')
-- Delete messages. This DOES NOT Work.
-- results:delete_messages()

-- This Works

account1.INBOX:delete_messages(results)