I've suddenly run into a problem where Mail won't send -- to anybody. Error message: "This message could not be delivered and will remain in your Outbox until it can be delivered. "The sender address [my email address] was rejected by the server." The server, in this case, would be Time Warner Cable. But I can't think of any reason they would suddenly block me from sending mail while allowing me to receive to that address just fine. And the rest of my internet, including my Yahoo mail account, is up and running as usual. I think I may be looking at a corrupted application here. So my question is, can I do an uninstall/reinstall of Mail without completely reinstalling OSX (10.4.11)? Thanks.