I have a Linux server that receives email and send emails on domain mycompany.com. This is a new Linux server that has POP3, IMAP and SMTP opened and has a public IP. I have a new Exchange server that is behind a Firewall that blocks all incoming traffic. The idea is to configure this Exchange and something like POPBeamer, which is a higher-end POP3 connector to retrieve emails from that Linux server. So far so good.
Here is my question, I would like to bring this server online gradually. The problem is that when I add a user to the Exchange and that user is sending to another internal email (the exchange is configured to handle mycompany.com). if that other accounts isnt created on the Exchange. It wont send it to the Linux, but keep it locally. If this account is created on the Exchange it will send it, but the users who are not configured to work on the Exchange yet will not receive it, since its staying locally on the Exchange. Any ideas on how to solve this issue?
Should I just bring the SMTP connector and have all emails send using the external IP address of the Linux server? Will that bypass the Exchange?
Any ideas will be greatly appreciated.