Hi, I've been using ISPConfig for some time (couple of years) and have quite a few users and an even larger number of email accounts. I have a need to use a separate email server to the one that comes with ISPConfig. I've built the new server, and am at the point where it is ready for testing. I would like to be able to send a copy of all emails that are currently being delivered to the ISPConfig Server to my new server (ie keep them on the existing server for now (just in case anything goes wrong!) and copy to the new server.) I've looked at the advanced user settings in ISPConfig, and have reconfigured one user so that it is forwarded to firstname.lastname@example.org with a tick in the "keep copy" box. I've also set up a user called email@example.com on my new server. However, what I can't figure out is how to handle the DNS. I've set newserver.com up in my host file (on the ISPConfig server), but I am getting the following postfix error: I don't own newserver.com so I don't think I can set up any proper authoritive DNS for it??? I *think* I need to set something up in the postfix transport file to achieve what I want, but am not quite sure! Also... what I am trying to do is only required as an interim measure for testing. Once I've got everything ready I would change my existing MX records to point to my new server. Thanks! James.