Two Exchange servers one Public IP

So I have two Exchange servers in my office. One has been working forever no worries.

 I just moved a second one in a couple of days ago. (it will be in my office for about 2 months)

The second server need to be able to send receive and connect to the OWA and Smart phones and connect to offsite outlook of course,

I have changed the second server to receive mail on port 26 then on my router I have told all traffic from port 26 ->  to change to port 25 on the second IP.

So I can send and receive emails no worries. The next issue is I need OWA access to work. This runs on port 443.

The existing server is of course already using this port.

What can I do.

I can;t get a second public IP as my router does not allow this.
A second internet connection is possible if I have no choice.
AlwayslearningmoreAsked:
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ChrisSenior Technical ArchitectCommented:
a second internet connection would be an easy way otherwise you would have to do something internally to separate out the traffic
you could PAT the address so externally it connects on 4433 (or something else) and this translates to 443 as it comes insdie

Or if you have a reverse proxy i.e. TMG, Kemp or something similar then you can redirect traffic via host headers or just run then you can point both DNS records to the same IP and same port and it separates out the traffic

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