Using a alternative port for a GMS client

I know this question is not directly GMS, but I have been searching Google and Apple without finding the answer.
I want to have GroupWise web access on default port 443 - and I would like to use GMS to get mail and calendar on iOS clients.

So I will make a NAT rule in the firewall translating an alternative port to my GMS server on port 443.
Can this alternative port be configured in an iOS mail account (Exchange type)?
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  • In article <>, Jledoledec
    > On iOS, you can specify a port by using <gsmnameserver:<portnumber>

    Just because you can specify an option, doesn't mean the app/device is
    actually using it. That part could be broken in the current patch
    level of iOS being used. We'd have to test with a packet scan to be

    Andy of in Toronto
    Knowledge Partner
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