Thanks for replies, but my version does not include the highlight filters option. I can manually remove the bounce option from each email in turn, but wanted an option that would delete without automatically bouncing. All deletions are not marked for bouncing though, so there must be something causing this.
click 'tools/options/blacklist & friends list' and untick 'mark blacklisted messages for bouncing' tick 'auto delete blacklisted messages' if you already have added addresses to the blacklist and they will automatically be deleted if they are on the list, any more you add to the list will also be auto deleted without bouncing.
ps. set up your friends list to make sure they get through.