Managing an organization's email signatures on Microsoft 365 quickly raises the same questions: how to deploy them everywhere without touching each device, how to target them by department, how to stay compliant with Quebec's Law 25, and where the data is hosted. Our guides answer each one, from deployment method to data sovereignty.
Three main methods exist to manage signatures in Microsoft 365: Exchange transport rules (server-side), GPO deployment (Windows only), and the event-based Outlook add-in (client-side, cross-platform). The add-in is the only approach that covers desktop, web, Mac and mobile while keeping the email inside Microsoft.
Where to start
If the topic is new to you, start with the reference guide: Microsoft 365 email signatures, which compares the three methods. For the regulatory issues specific to Quebec, read Email signatures and Law 25. To choose a tool, see our comparisons.
What you'll find here
- Deployment — apply a signature to the whole organization, by group or department.
- Native methods — Exchange transport rules, GPO, and their limits.
- Platforms — Outlook Windows, web, Mac and mobile (iOS/Android).
- Data — dynamic signatures via Microsoft Graph, Canadian hosting, sovereignty.
- Compliance — Law 25 and email confidentiality notices.
All pages in this section
- How to add a signature in Outlook, client by client
Exact click paths for the new Outlook, classic Outlook, Outlook on the web and Mac, replies included, and why every employee ends up with a different signature. - Completing a POPA PIA for an email signature tool
What an Alberta POPA privacy impact assessment asks about a vendor, with a pre-filled sheet for an email signature add-in. Not legal advice. - Client-side or server-side signatures: understanding the email's journey
Client-side or server-side email signatures? How the email travels in each case, a comparison table and why client-side better protects confidentiality. - Email confidentiality disclaimers: what they do, their limits, and ready-to-use templates
What an email confidentiality disclaimer does, its legal limits, and 3 copy-paste templates (French and English) aligned with the spirit of Quebec's Law 25. - Schedule a holiday banner for every employee in Microsoft 365
Schedule a holiday banner in every Microsoft 365 employee's signature: banner size, the steps in ATOM, start and end dates, and targeting a single group. - Creating and editing a signature in the ATOM editor, step by step
Step-by-step guide to the ATOM Signatures editor: template, logo, links, dynamic fields (name, title), preview, assignment and saving, with screenshots. - Deploying an Outlook signature organization-wide: methods, steps and pitfalls
How to deploy a centralized Outlook signature for every employee: transport rule, GPO, Outlook add-in, Microsoft 365 prerequisites, steps and common pitfalls. - How to stop users from editing their Outlook signature, client by client
Can you lock Outlook signatures in Microsoft 365? Client by client, what Microsoft Learn documents: classic, new Outlook, web, Mac, iOS and Android. - Is my email signature tool affected by the end of EWS?
Is your Microsoft 365 signature tool affected by the EWS shutdown? The dates (October 1, 2026 and April 1, 2027), how to check any tool, and why ATOM is not. - Canadian data hosting: what it changes for a SaaS tool
Data residency, Law 25 and the assessment before transferring personal information outside Quebec: what Canadian hosting means for a SaaS, and how to verify it. - Outlook signature image not showing: causes and fixes
Logo missing for recipients, sent as an attachment on mobile, blurry or gone in dark mode? Match the symptom to its cause: PNG or JPG, 96 DPI, fixed size. - Professional email signature templates: structure, best practices and examples
What should a company email signature include? Recommended structure, described templates, hierarchy, bilingual EN/FR, image weight and accessibility. - Ontario real estate agent email signature: what RECO expects
What RECO Bulletins 5.1 and 5.2 say about an Ontario agent's email signature: brokerage name, registered name, permitted titles, with copyable models. - Leaving Email Signature Manager before EWS shuts down: your options
What replaces Symprex Email Signature Manager once EWS is gone? Four neutral options, the criteria to choose between them and the steps of a migration. - Why doesn't Set-MailboxMessageConfiguration set signatures anymore?
Set-MailboxMessageConfiguration no longer sets signatures? Roaming signatures are the cause. The cmdlets, PostponeRoamingSignaturesUntilLater and its limits. - Why is my Outlook signature missing or at the bottom when I reply?
Why is your signature missing or at the bottom of the thread on a reply? Behavior in the new Outlook, Outlook mobile and native settings, with workarounds. - Company signature with a logo on Outlook for Android and iPhone
Can Outlook for Android show a logo in the signature? Not the built-in one, which is text only; an event-based add-in can set an HTML signature with an image. - Lawyer and notary email signature in Quebec: what to include
Name, title, bar or notary membership number, confidentiality notice: what a lawyer's or notary's email signature should include in Quebec. - Accountant (CPA) email signature in Quebec: what to include
Correctly formatted CPA title, permit number, name registered with the Order: what a CPA's email signature should include in Quebec. - Real estate broker email signature in Quebec: what to include
OACIQ licence designation, agency name, name as registered on the licence: what a real estate broker's email signature should include in Quebec. - Does your email signature make every email a CASL message?
Does a logo or link in your email signature make every email a CASL commercial message? What the CRTC says, the stricter views, and the dates. Not legal advice. - Email signatures and Law 25: what Quebec organizations need to know
Does Quebec's Law 25 apply to company email signatures? Personal information, Canadian hosting, client-side architecture and a compliance checklist. - Managing email signatures in Microsoft 365: methods, limits and deployment
The three ways to manage email signatures in Microsoft 365: Exchange transport rule, GPO and the Outlook add-in. Comparison, Graph data and a deployment checklist. - Dynamic signatures with Microsoft Graph: directory attributes and real-time data
How Microsoft Graph feeds always-current Outlook signatures from directory attributes (name, title, department, phone), using read-only access to profiles. - Signatures in the new Outlook for Windows: how to recover and centralize them
Where the new Outlook stores signatures, what roaming signatures can't enforce, and how Microsoft 365 / Office 365 admins deploy one signature to all. - Deploying an Outlook signature with Group Policy (GPO)
How to deploy an Outlook signature with Group Policy: logon script or GPP, NewSignature registry keys, and why it fails on Mac, mobile and new Outlook. - How to add a signature in Outlook for Mac (new and legacy)
Create, edit and set a default signature in the new and legacy Outlook for Mac, logo included, and why it does not follow you to Windows or the iPhone. - Making the Outlook signature consistent on Mac, iPhone and Android
Outlook's native signature is inconsistent from one device to the next. How a client-side add-in deploys one uniform signature on Mac, iPhone and Android. - Assign an email signature by group or department in Microsoft 365
How to assign a different email signature per Microsoft 365 group or department, manage priority rules and handle employees who belong to several groups. - Add a signature with an Exchange transport rule (and its limits)
Create an Exchange transport rule to add a signature or disclaimer, its limits (images, Sent Items, duplicates) and when to move to a client-side add-in. - Canadian-owned email signature software: ownership, not just hosting
Does Canadian hosting protect your data from U.S. law? Ownership versus hosting, the CLOUD Act, the Privacy Commissioner, and questions to ask any vendor. - Email data sovereignty: what it changes for a Quebec organization
Data sovereignty versus data residency: what the difference means for your email and signatures, and how a Quebec organization can reduce its legal exposure.