2026-09-08
Outlook for Mac lacks important signature-management capabilities that organisations often expect in a Microsoft 365 environment.
A signature created or managed on another Outlook client does not necessarily provide the required experience on macOS. Users can be left with outdated local signatures, manually copied content or no suitable signature for a shared mailbox or delegated sending identity.
Set-OutlookSignatures and the Benefactor Circle add-on address these limitations in two ways:
- Run Set-OutlookSignatures directly on the Mac to generate and synchronise roaming signatures.
- If local execution is unavailable or unsuitable, generate the signatures centrally with SimulateAndDeploy and make them available through the Outlook Add-in.
The choice primarily depends on whether PowerShell and Set-OutlookSignatures can run on the Mac.
🔗Why Outlook signature management on macOS needs additional planning
A centrally maintained signature template does not automatically guarantee that the corresponding signature will be available and current in Outlook for Mac.
Without a managed process, organisations commonly encounter the following problems:
- users maintain signatures manually;
- changes to branding or legal text reach Macs late or not at all;
- contact details no longer match directory information;
- users create different versions of the same corporate signature;
- signatures for shared mailboxes and delegated sending identities are missing;
- support teams cannot determine whether a signature is current;
- signature behaviour differs between Outlook for Mac and other Outlook clients.
These problems become more visible in environments where users work with several Outlook clients, including Classic Outlook for Windows, New Outlook, Outlook on the web, Outlook for iOS or Android and Outlook for Mac.
Set-OutlookSignatures provides a common source for signature templates, directory data and assignment rules. The Benefactor Circle add-on extends this model to cover macOS, roaming-signature synchronisation, centralised processing and the Outlook Add-in.
🔗Option 1: Run Set-OutlookSignatures on the Mac
When PowerShell is installed and Set-OutlookSignatures can run on the device, the signatures can be generated directly on macOS.
This applies whether the Mac is the user's primary computer, a secondary device or one of several managed Macs. The technical process remains the same.
Set-OutlookSignatures runs in the signed-in user's context and:
- processes centrally maintained signature templates;
- retrieves the required user and mailbox information;
- applies the configured assignment rules;
- generates user-specific and mailbox-specific signatures;
- synchronises the generated signatures for use in Outlook for Mac;
- refreshes the signatures when the process runs again.
This brings managed roaming-signature support to Outlook for Mac without requiring users to copy or maintain signatures manually.
🔗Central templates remain the source
The signature is not designed independently on the Mac. Set-OutlookSignatures uses the organisation's centrally maintained templates and configured data sources.
Depending on the configuration, signatures can include information from sources such as:
- Microsoft Entra ID;
- Active Directory;
- Exchange recipient information;
- other configured data sources;
- calculated or custom values.
Assignment rules determine which templates apply to each user and mailbox.
When a template, directory attribute or assignment changes, the next execution recreates the affected signatures from the current configuration.
🔗Suitable scenarios
Running Set-OutlookSignatures directly on macOS is suitable when:
- PowerShell can be installed on the Mac;
- the device is managed by the organisation;
- Set-OutlookSignatures and its configuration can be distributed reliably;
- the process can run at sign-in or according to a schedule;
- the Mac is available frequently enough to receive updates;
- local signature generation fits the organisation's endpoint-management model.
The organisation can distribute the application, configuration and templates through its existing device-management process.
Administrators should review the documented common restrictions and notes for Linux and macOS before transferring an existing Windows deployment to macOS.
🔗Update frequency
The frequency of signature updates depends on how often Set-OutlookSignatures runs.
For example, the process could run:
- when the user signs in;
- once per day;
- at regular intervals;
- through a scheduled endpoint-management task;
- when an administrator initiates an update.
The schedule should reflect how quickly changes to templates, directory attributes or mailbox assignments need to reach users.
A device that remains offline will continue to use the signatures already available locally. It will receive updated signatures the next time Set-OutlookSignatures can run successfully with access to the required data sources.
🔗Primary and secondary Macs
There is no need to define separate technical approaches for primary and secondary Macs.
If PowerShell and Set-OutlookSignatures are available, both can use the same local process. The relevant questions are operational:
- Is the device managed?
- Can the required components be deployed?
- Does the user sign in regularly?
- Can Set-OutlookSignatures run frequently enough?
- Is the device able to reach the required templates and data sources?
A secondary Mac that meets these requirements can use the same roaming-signature process as a primary Mac.
🔗Option 2: Use SimulateAndDeploy and the Outlook Add-in
Running Set-OutlookSignatures directly on every Mac is not always possible or desirable.
Typical examples include:
- PowerShell is not installed;
- organisational policy does not permit PowerShell on the device;
- the Mac is unmanaged;
- the device is used under a BYOD model;
- the Mac is only used occasionally;
- software and configuration cannot be deployed reliably;
- maintaining a local Set-OutlookSignatures installation would add unnecessary operational work.
In these situations, signature generation can move to a centrally controlled system.
The Benefactor Circle add-on provides SimulateAndDeploy mode for this purpose. Set-OutlookSignatures generates the user-specific and mailbox-specific signatures centrally rather than on the Mac.
The Outlook add-in then provides access to the generated signatures in supported Outlook clients, including Outlook for Mac.
🔗How central signature management works
The process consists of three practical steps:
- Set-OutlookSignatures runs on a central system in SimulateAndDeploy mode.
- It processes the same central templates, directory data and assignment rules used for locally generated signatures.
- The generated signature information is made available to supported Outlook clients and used by the Outlook Add-in.
The user does not need to install PowerShell or run Set-OutlookSignatures on the Mac.
The signatures remain user-specific and mailbox-specific. Centralised processing does not mean that every user receives the same generic signature.
🔗Suitable scenarios
SimulateAndDeploy with the Outlook Add-in is suitable when:
- PowerShell cannot be installed on the Mac;
- the device is unmanaged;
- the organisation does not control the local software configuration;
- users work mainly from mobile, web or occasional devices;
- signatures should be generated according to a central schedule;
- local execution cannot be relied upon;
- signature selection requires Outlook Add-in launch events or contextual rules.
This approach also reduces the need to maintain Set-OutlookSignatures installations on individual Macs.
🔗Central permissions and scheduling
In local mode, Set-OutlookSignatures runs in the signed-in user's security context.
In SimulateAndDeploy mode, the central process runs under an appropriately authorised identity. That identity requires access to the users and mailboxes included in the deployment.
The organisation should therefore define:
- which users and mailboxes are processed;
- which identity performs the central processing;
- which Microsoft 365 permissions are required;
- how access is limited to the intended scope;
- how often the process runs;
- how failed or incomplete runs are monitored;
- how changes are tested before wider deployment.
The central schedule determines how quickly changes reach users. A daily run may be sufficient for normal directory updates, while time-sensitive branding or compliance changes may require more frequent processing.
For broader deployment planning, see the Set-OutlookSignatures implementation approach.
🔗Where the Outlook Add-in fits
The Outlook Add-in is part of the Benefactor Circle add-on.
It does not replace signature templates, directory data or assignment rules. Set-OutlookSignatures still performs the signature generation. The add-in makes the resulting signatures available and can apply selection logic within supported Outlook clients.
This is particularly useful when Set-OutlookSignatures cannot run directly on the Mac.
The Outlook Add-in can also support contextual and event-driven signature behaviour. Depending on the configured and supported launch events, this may include scenarios where:
- the user changes the sending mailbox;
- a signature is needed for an appointment;
- selection depends on item or recipient properties;
- a signature should be checked when an item is sent;
- selection depends on the item's sensitivity label.
🔗Shared mailboxes and delegated sending
Shared mailboxes and delegated sending require special attention on macOS.
The correct signature may need to represent the mailbox selected as the sender, rather than the signed-in user.
For example, a user may send:
- from a shared mailbox;
- with Send As permission;
- with Send on Behalf permission;
- from another permitted mailbox or sending identity.
A manually created signature usually cannot respond reliably to all these scenarios. Users must remember which signature to select, provided that the required signature exists on the device at all.
Set-OutlookSignatures can generate signatures for the relevant user and mailbox identities based on the configured templates, permissions and assignment rules.
The Outlook Add-in can further assist where signature selection depends on the sender selected while composing a message.
The required behaviour should be tested with the organisation's actual mailbox and delegation configuration. Send As, Send on Behalf and shared-mailbox scenarios do not all represent the sending identity in exactly the same way.
🔗Which option should you choose?
The main decision is whether Set-OutlookSignatures can run reliably on the Mac.
🔗PowerShell is available and the Mac can run Set-OutlookSignatures
Run Set-OutlookSignatures directly on macOS.
This provides:
- local signature generation;
- synchronisation of roaming signatures;
- regular updates from central templates and directory data;
- user-specific and mailbox-specific signatures;
- continued access to the last generated local signatures when the device is temporarily offline.
This is usually the most direct approach for managed Macs.
🔗PowerShell is unavailable or the Mac is unmanaged
Use SimulateAndDeploy with the Outlook Add-in.
This provides:
- centrally generated signatures;
- no requirement to run Set-OutlookSignatures on the Mac;
- support for unmanaged and BYOD devices;
- centrally controlled processing schedules;
- signature availability through the Outlook Add-in;
- contextual signature handling where supported and configured.
🔗The organisation has a mixed macOS environment
The two approaches can be used together.
For example:
- managed Macs run Set-OutlookSignatures locally;
- unmanaged Macs use centrally generated signatures;
- users without PowerShell use SimulateAndDeploy and the Outlook Add-in;
- central templates and assignment rules remain common across both approaches.
This allows the organisation to choose the appropriate delivery model for each device population without maintaining separate signature designs.
🔗Turn every small email moment into a professional advantage
Email signatures and out-of-office replies may seem minor, but think about how often people see them.
We help organizations centrally manage and standardize these touchpoints across all users — unified Outlook branding everywhere, with zero external data exposure. No manual effort, no inconsistencies, no data leaving your environment. With Set-OutlookSignatures, every email becomes a consistent, secure, and fully controlled brand experience.
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