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adm8888's avatar
adm8888
Copper Contributor
Dec 22, 2020

S/MIME in Outlook for iOS / Android with Exchange on-premise?

Hello, I'm trying to figure out if the S/MIME-certificate-functionality in the Outlook app only applies to Office 365 or to Exchange on-premise as well (no hybrid). I don't see the option to enable S/MIME in the app for my Exchange account:

Exchange account

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Here's a screenshot from the documentation with the security options:

Office 365 account

 

Exchange Server

2 Replies

  • itnovative's avatar
    itnovative
    Copper Contributor
    May 27, 2022

    adm8888I am having the same issue. Only when you select a Exchange Online account you get additional security options to add a digital certificate but not when you are using on-premise Exchange.

     

    Apparently this hasn't changed since 2020.

     

    I am completely baffled by this. Will have to go back to Android E-mail app which has the option to add a digital certificate for every mailbox.


    Please Microsoft, add this functionality for on-premise mailboxes as well.

     

     

    • itnovative's avatar
      itnovative
      Copper Contributor
      May 27, 2022
      Also see;
      https://techcommunity.microsoft.com/t5/intune-customer-success/s-mime-functionality-available-in-outlook-for-ios-testflight/ba-p/734885

      SiobhanTX
      New Contributor
      ‎Dec 10 2019 11:21 AM

      Ross Smith IV : Will Outlook for iOS ever support S/MIME for on-premises Exchange 2019? This is the only thing that prevents us from using the application. It is artificially hobbled in S/MIME support to just 365 accounts. iOS Mail, while in many ways inferior to what Microsoft has created with Outlook for iOS, at least supports S/MIME for on-prem.
      Ross Smith IV
      Microsoft
      ‎Dec 10 2019 12:51 PM

      SiobhanTX It's possible we'll be able to support S/MIME for on-premises accounts leveraging hybrid modern authentication (http://aka.ms/hmaom) once those accounts are migrated to the native Microsoft sync technology. We require an Exchange Online tenant because we're leveraging the S/MIME virtual cert collection for certificate validation (see http://aka.ms/omsmime for more information).

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