Randomly a few weeks ago my friend stopped receiving texts I send to him. I receive all the ones he send to me though. Not sure why this should happen randomly with just one person?
I think there was a fix on the official Froyo ota. You can go back to DL09 and start the ota update process to get to official Froyo ED01/ED03. Check the development forum for the files if you want to do so unless your fine with your setup.