A Google search provided me with the following thread:
I'm experiencing the exact same issue. Unfortunately the above thread was closed as resolved with no actual resolution posted. :(
I do have the "Delete email after posting:" set to no and although that may very well fix it, until I can confirm this, I am not interested in having the email deleted. There is a reply in that thread where a user says it stopped making posts altogether. No post and no email = lost data. No good.
Thanks for your time.