Email Signature for Outlook 365
Email signature configured for the Outlook client on Microsoft 365, supporting Roaming Signatures across devices and central administration via Exchange transport rules or Outlook add-ins.
What is Email Signature for Outlook 365?
An email signature for Outlook 365 (the Outlook client connected to a Microsoft 365 mailbox, as opposed to Outlook connected to an on-premises Exchange server) benefits from Microsoft 365's cloud-native features. Roaming Signatures stores each user's signatures in their Exchange Online mailbox so the same signature appears in Outlook desktop, web, and mobile without per-device setup. For organizational management, IT administrators have two centralized deployment paths: Exchange Online Transport Rules apply signatures at the mail server before delivery (universal coverage including third-party clients), and centrally deployed Outlook add-ins inject signatures at compose time (preferred for dynamic personalization). Outlook 365 supports the full Microsoft Graph API for directory data, which means signature management platforms can read user attributes (displayName, jobTitle, department, mobilePhone) and inject them into templates. The combination of Microsoft Graph API access, Exchange transport rules, and Outlook add-ins makes Microsoft 365 the most flexible environment for centrally managed email signatures.
Also known as
How does SyncSignature implement Email Signature for Outlook 365?
SyncSignature for Microsoft 365 uses a centrally deployable Outlook add-in (Microsoft AppSource ID wa200010352) for compose-time signature injection, paired with Microsoft Graph API directory sync (Entra ID) reading user attributes on the daily cadence.