The company I work for uses an exchange 2003 server for mail and of course this is giving some problems. In OSX mail I've added the account as IMAP and receiving mail works. Sending with the same settings doesn't work, but it does work for my boss who's in the same network as the server (I'm not). I've synched the mail account to my iPhone and it doesn't work here either. I've searched for this problem and it seems Apple and Exchange 2003 is a terrible combination, but I couldn't find any solution. Does anyone has a possible solution?