Dear experts! I have to setup the demonstration mail server - exchange 2k3 to a company (their look forward to migrating exchange 5.5 to exchange 2k3). This has to be done with run both servers in parallel (exchange 5.5 & exchange 2k3) not affect to the existing users in exchange 5.5. Exchange 5.5 server --> ex55.abc.com Exchange 2k3 server --> e2k3.abc.com I setup the DNS server - abc.com. MX 10 ex55.abc.com. abc.com. MX 15 e2k3.abc.com xyz.com. MX 20 mail.xyz.com. $ORIGIN abc.com. ex55 A 192.168.100.1 e2K3 A 192.168.100.2 My question is - If I create a user (john@xxxxxxx) in e2k3.abc.com server, will get mails from the internet to john@xxxxxxx? The user JOHN not exists in the ex55.abc.com server. If possible can some one explain how a mail from internet finds the user in ex2k3.abc.com. Thanks in advance - Hirantha Disclaimer and Confidentiality This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The Asian Hotels & Properties Limited accepts no liability for any damage caused by any virus transmitted by this email. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission.