The last time I checked, (a couple of months ago) unread PM's or PM's marked as "read later" that are deleted don't show in the outgoing messages section, the sender will still think the message has been read. The point of the "supress messages feature" is to cancel a message so it cannot be read. The pm to e-mail system makes this feature pointless if the reciever clicks the lit-up envelope to find the message gone, then checks their e-mail to read the message that was suppossed to be suppressed. if a delay was added to the e-mail being sent, and the sender given a warning that they have an X amount of minutes to suppress it before it is sent via e-mail, the system would be better in my opinion.