ExSign: Client-Side Signature Limitation in Outlook for iOS and Android

Overview:
ExSign client-side signature functionality uses Outlook add-ins to insert email signatures directly into messages. However, Microsoft Outlook for iOS and Android does not support the required add-in capabilities for client-side signature functionality in on-premises Exchange environments.

As a result, client-side signatures cannot be implemented in Outlook mobile applications for on-premises Exchange environments. This article explains the limitation and provides links to the relevant Microsoft documentation for further reference.

Client-side signature functionality requires specific Outlook add-in capabilities to insert signatures directly into email messages before they are sent.

Microsoft Outlook for iOS and Android does not provide the full set of add-in capabilities required to support this functionality in on-premises Exchange environments.

Therefore, ExSign client-side signatures are not supported in Outlook for iOS and Android when using on-premises Exchange environments.

For more information about Outlook mobile add-ins and their platform requirements, refer to the following official Microsoft documentation:

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