It has been brought to my attention that there is a serious bug in these two combination patches. The bug can result in mail being lost in the event of a temporary (400 series) error occuring during mail delivery to a remote server. The bug can also prevent non-delivery notifications from being sent to the sender when a permanent (500 series) error occurs. These problems occur only when smtp authentication is not used when sending email. Receiving email is not impacted. Older versions of these patches may also be affected but I haven’t tested them to be sure. I’m currently testing new versions of my patches that correct this bug. If you are using any version of the qregex patch, then you’re safe. The bug only impacts my combination patches. If you want to help me test the fix, drop me a line.