Anytime - I am very familiar with Plesk. You may want to wait until you really need me again, though, as your original problem may not be a problem anymore. I *could* help by compiling in "outgoingip" (allows you to choose which of your IPs to send from) and "big-todo" (so your queue doesnt get stuck on failing addresses such as Yahoo or HotMail]) qmail patches, however. I know how to do that without breaking Plesk.
Regards