Newmousecateer, I can't imagine anyone putting YOU on their IGNORE list . I certainly never use the function.......I LOVE receiving Hate mail . In any event, my understanding is that any PMs which you'd send to someone who is Ignoring you would NOT show up in THEIR mailbox; however, I would think that they would show up in your SENT file.......
newmousecateer, I did play around with the ignore feature by putting a friend of mine I PM all the time on ignore. I wouldn't see any of the PMs that they sent to me, but every single one I sent them showed up. As nativetxn suggested, make sure that you have the box checked that will save the PMs in your sent box. Also to make sure it was sent, you can always check the "Message Tracking" area to make sure it was actually sent out