Microsoft 365 Signature Management

How it works

Take email signatures off IT's plate

Deploy Outlook signatures company-wide in about 30 minutes

Connects to Entra ID via Microsoft Graph API with read-only permissions
Outlook Add-in deploys centrally from the M365 admin center — no per-device installs
Server-side relay appends signatures at the mail layer
After setup, ongoing maintenance and updates are SignSyncer's responsibility

Built with enterprise security practices in mind

Data encrypted in transit and at rest
Directory sync is strictly read-only
SSO and role-based access control (RBAC) for Admin and IT roles
Server-side mail injection operates at the relay level only

What Microsoft 365 admins need to get started

An active Microsoft 365 tenant with Entra ID — no on-prem hardware required
Admin access to the Microsoft 365 admin center for initial deployment
Read-only Graph API permissions for directory sync — no write access requested
No software installed on employee devices

Diagram of the SignSyncer Office 365 implementation architecture, showing directory sync, the Outlook add-in and the Exchange Online mail flow connector

SignSyncer enterprise security overview: encrypted data, read-only directory sync, SSO and role-based access control, and server-side signature injection

SignSyncer syncing a Microsoft 365 user directory, with a super admin account connecting the tenant to the SignSyncer platform

"I don't have to set up new users manually — it happens the moment they're created."

— Early access design partner, Director of IT

Centralized control

Manage signatures without touching individual mailboxes

One update deploys to every mailbox instantly
Lock brand fields, let employees edit personal ones
Audit log tracks every change with a timestamp

Entra ID integration

Sync signature data directly from Entra ID

New hires get a signature the moment they're provisioned
Departing employees' signatures deactivate automatically
Dynamic fields pull name, title, and phone automatically

SignSyncer pulling name, job title, company, email, website and branding directly from Microsoft Entra ID into a live email signature

Cross-device consistency

Identical signatures across every Outlook client

Outlook desktop, web & mobile

Covers desktop, web, and mobile clients with the same rendering.

Windows, Mac, iOS, Android

Same layout regardless of operating system.

No broken logos or content

Consistent rendering, every time, on every client.

Deployment options

Deploy via Outlook Add-in, server-side, or both

Outlook Add-in

Deploy from the Microsoft 365 admin center — no per-device installs.

Server-side injection

Signatures are appended automatically at the mail layer.

Hybrid

Run both for compose-time preview and guaranteed cross-client coverage.

Team capabilities

Give every team what they need

Give marketing autonomy to design and update signatures

No-code drag-and-drop signature design
Banner campaign scheduling
Signature click and impression analytics

Give every rep a signature that drives pipeline

Embed demo booking or resource CTAs in every rep's signature
Sync rep details automatically from your CRM
Schedule banners around launches or campaigns

Sales email signature template for a sales executive, with contact details, social links and a call-to-action strapline

Enforce the right disclaimer in every email

Disclosures and confidentiality clauses assigned by department
Every email from that group carries the correct disclaimer automatically
Audit log shows which disclaimer was active, for any user, on any date

Legal email signature template for legal counsel, with contact details and a compliance-focused strapline

Turn every email into a channel for feedback

Review widgets pull your current rating automatically
One-click CSAT or survey link in the signature
Social feed widget surfaces recent content on every send

Customer success email signature template for a support specialist, with contact details, social links and a support strapline

Automate the signature lifecycle end-to-end

New hires get a fully formatted signature on day one
Departing employees' signatures deactivate automatically
Contact handoff redirects to the right person after departure

HR email signature template for an HR manager, with contact details, social links and a people-first strapline

Native vs. SignSyncer

What does native Microsoft 365 signature management leave unsolved?

Capability	Native Microsoft 365	SignSyncer
Signature inserts below latest reply	No	Yes
Embedded images and logos	No	Yes
Visibility in Sent Items	No	Yes
Compose-time signature preview	Server-side only	Yes (Add-in)
Consistent across all Outlook clients	Unreliable	Yes
Auto-provision new hires from Entra ID	Manual	Automatic
Disclaimer enforcement by department	No	Yes
Marketing banners & click analytics	No	Yes
Audit trail and change history	No	Yes

Take control of company email signatures

Stop signature chaos. Roll out standardized, brand-consistent signatures company-wide in less than a day.

Try SignSyncer Book a demo

FAQ

Office 365 signature questions

A tool that centrally deploys and controls email signatures across Microsoft 365 mailboxes — syncing employee data from Entra ID, enforcing brand and compliance templates by department, and rendering consistently across every Outlook client.

Microsoft 365 includes a basic native organization-wide signature option, but signatures don't reliably appear below the latest reply, images can't be embedded natively, and rendering varies across Outlook clients. SignSyncer addresses these gaps with centralized deployment from Entra ID.

No. The Outlook Add-in deploys centrally from the Microsoft 365 admin center, and server-side injection appends signatures at the mail layer — neither requires visiting individual machines.

Assign department-specific disclaimer text once, and it's locked into every outgoing email from that group automatically. The audit log records which disclaimer was active for each user on any date.

When an employee is deprovisioned in Entra ID, their signature deactivates automatically — no manual IT step required.

Control & automate Office 365 signatures