After a new person registers on my forums, s/he has a blinking envelope at the top of the page indicating that they have an unread private message. However, if they click on the envelope they are taken to the "Your Private Messages" page where there is not a message waiting for them.

If I go to ubbt_PRIVATE_MESSAGE_POSTS, I can find the message, which is an automated welcome message from me.

My users are frustrated about not being able to remove the flashing envelope from the top of the page, and I would like for them to receive my welcome message. Does anyone have any suggestions?