Ensure consistent, compliant, automated email signatures for your whole organization.

Note: For the Exclaimer add-in for Outlook, please go to AppSource.

Why Exclaimer

Managing email signatures at scale takes more time than it should. Contact details differ, formatting breaks, and users send emails from devices you can’t easily control. Exclaimer removes that overhead by centralizing and automating email signature management for Microsoft 365, without relying on end users.

IT teams get full control, so brand and compliance standards are met on every email, while marketing teams can run targeted campaigns without sending every change through IT. No manual updates, no scripting, and no signature drift.

More than 75,000 organizations worldwide trust Exclaimer for secure, scalable email signature management built for simplicity and control.

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Core benefits and features

Centralized email signature management: Design and deploy email signatures for every user from one web portal.
Easy signature design: Create email signatures with a simple drag-and-drop editor. No coding required.
Consistent across all devices: Apply the same signatures on desktop, mobile, or tablet.
Directory sync: Auto-populate signatures with user details from Microsoft Entra ID (Azure AD).
Targeted signature campaigns: Apply marketing banners based on specific signature rules such as recipient, sender, or region.
Compliance and brand control: Keep legal disclaimers, certifications, and brand elements consistent on every email.
Granular access controls: Assign role-based permissions so IT stays in control while other teams update content safely.

Secure and compliant

Exclaimer is built with security and compliance in mind:

SOC 2 Type II, ISO 27001, and ISO 27018 certified
GDPR and HIPAA compliant
100/100 SecurityScorecard rating
Protected with TLS encryption, IPS, firewalls, and DDoS defences
Developed with a DevSecOps approach

Reliability you can trust

Hosted across 14 load-balanced Microsoft Azure datacenters in 7 global regions
Built-in regional failover for continuity of service
24/7 monitoring with real-time alerts
99.99% uptime guaranteed
24/5 technical support backed by 24/7 AI support for fast answers

How it works

Secure integration: Exclaimer connects to Microsoft 365 using secure Exchange Online connectors, processing everything in Microsoft Azure. This gives IT a controlled path for signature handling.
Server-side application: Signatures are added as email routes through Exclaimer, so every message gets the right signature on any client or device.
Centralized control: Manage email signature designs, user assignments, and permissions from one dashboard.
Outlook Add-In (optional): Let users see their signature in Outlook as they write, without changing how signatures are applied. Works alongside server-side deployment for flexibility and compliance.
Always up-to-date: User details sync automatically from Microsoft Entra ID, so signatures stay current without manual updates.

Trusted by global brands

Organizations like BBC, Xerox, Cisco, Unilever, and Sony use Exclaimer to deliver consistent and compliant email signatures at scale.

Exclaimer: Centralized email signature management

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