New SMTP server testing

Hi Guys
can you help me with the following?-
we have an Exchange migration project, so I will need to make changes on the firewall to allow the emails to be delivered on the new server.
having a different IP address on the new server, I will need to create a new NAT rule and access-lists.
the question is if I use port 25 for the new NAT rule it will remove the existing NAT rule which I dont want as the new mail server is still in the testing phase and I dont want to break the connection.
can you please advise how do I test this new server for email sending without removing old one?
I am using a CISCO881 router.
existing NAT rule is-
ip nat inside source static tcp 192.168.1.50 25 interface FastEthernet4 25
and the new server IP will be 192.168.1.100
Thanks

Hi Collin
no I have only one Public IP address.
just a question on top of the question-
what about if I create the new NAT rule with a different external port?
i.e.- ip nat inside source static tcp 192.168.1.100 25 interface FastEthernet4 25230
and then allow the port 25230 on the new server, will that work or I am talking non-sense?
Thanks

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    Thanks in advance for any insight.

    Please read this whole message before doing anything.
    This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
    The purpose of this test is to determine whether the problem is localized to your user account. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
    While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
    Test while logged in as Guest. Same problem?
    After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
    *Note: If you’ve activated “Find My Mac” or FileVault in OS X 10.7 or later, then you can’t enable the Guest account. The "Guest User" login created by "Find My Mac" is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

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