I maintain a Windows small business server 2003 with Exchange and SP2 installed and running. Only one NIC is installed. We are having an additional ADSL broadband line installed to cope with general demand. I have a dual WAN router which will cope with the extra line, and I have requested mail-relaying for the new line, however, I want to ensure that users can send and receive email utilising both circuits, once they’re installed. Just wondering if there was a guide to this anywhere, or whether anyone who’s done it might be generous enough to provide some pointers – in particular, I am not too sure what I’ll need to do within Exchange itself. I’m told I need to add an MX record showing the new line’s public IP so that incoming mail is received – does that sound right? Many thanks in advance for any help or advice.