Sigsync is a centralized, web-based service for managing and updating email signatures across all devices for Office 365 users.

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For Microsoft 365 organizations that need consistent branding and centrally managed email signatures, Sigsync lets administrators create templates and assign them to users with signature rules. Its web dashboard provides a central place to design and update signatures with employee details, logos, social links, banners, and legal disclaimers; user information can be populated from Azure Active Directory. Administrators can apply signatures on the server, use the Outlook add-in to insert them while composing, or combine both approaches. Server-side processing adds signatures to messages sent from different email clients and devices, while the add-in supports Outlook desktop, web, Mac, and mobile. Depending on the organization’s settings, users can preview or select signatures in Outlook. Sigsync is intended for teams managing company-wide signatures and disclaimers in Microsoft 365; setup requires administrator configuration, and may involve deploying the add-in or configuring mail flow.

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