Watchguard M270 Exchange Outlook Anywhere without SNAT

Hello Community,

i have a question about a Watchguard M270 with Total Security. Since i installed it i can use Outlook Anywhere with a SNAT Rule to the Exchange System. I want to hardening it a bit. Is it possible to use Outlook anywhere from it without this special SNAT Rule?
I do not want to open that to everyone. Does anyone have a better solution for that topic as the SNAT Rule? People should go to the portal and pre authentificate there, like it is now working for OWA, afterwards they should also be allowed to use outlook anywhere, but not before.

Thanks for any idea!


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