Hi, I've updated to 10.5.6 from 10.5.5 through software update on a late 2007 iMac. I have never installed any add-on's to mail but since the update I have had some problems with it. Firstly, when I try to quit the mail application, it hangs. Only mail hangs, the rest of the system is fine. I eventually have to force quit. Secondly, if mail has received some mail, it refuses to send or receive any more and I have to force quit and restart it again. I have rebooted, reinstalled the update from the combo download, deleted the mail preferences file and set up the mail accounts again but none of these has helped. Is there anything else I can try?