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Email signature manager for Office 365

Centrally manage Microsoft 365 (Outlook 365/Office 365) email signatures. Make sure every email signature is secure, on-brand, and compliant.

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Office 365 email signatures made simple

Centralized email signature management


  • Ensure consistency across emails. Guaranteed consistency on all emails. Get professional email signatures on all devices and mail clients, including mobiles and Macs.

  • Eliminate manual updates with centralized control. Manage Microsoft (Office 365) signatures from a single dashboard. Whether it's for a company rebrand, disclaimer update, or new marketing campaigns, you can deploy new signature templates in minutes.

  • Guarantee 100% accuracy. Make sure contact information is always up to date, with easy and automatic syncing from your Azure Active Directory (AAD).

  • Enable role-based access control (RBAC). Delegate email signature management to specific users or teams such as Marketing or HR. All while IT retains full control.

Flexible deployment options to fit your Microsoft 365 environment

Server-side configuration

Get Office 365 signatures on all devices and email clients


With Exclaimer’s server-side deployment, emails are securely routed through Exclaimer’s Microsoft Azure datacenters in your region via a mail flow rule.


The signature is applied seamlessly, before the email is returned to Microsoft 365 for final delivery.


  • Adds email signatures to all Microsoft 365 messages from any device

  • Maintains data security within your local Microsoft Cloud region

  • Promotes professionalism and ensures legal compliance in every email

  • Displays signatures in the Sent Items folder for complete transparency

Enterprise-grade reliability, security, and compliance

Uninterrupted performance, built for scale
Exclaimer’s Active-Active architecture, hosted in 14 Microsoft Azure data centers across 7 global regions, ensures continuous uptime. Features like automatic failover, load balancing, and regional redundancy guarantee consistent email signature application and continuity of service.

Robust security measures
Every email and data transfer is fully encrypted with TLS protection, while advanced firewalls, active DDoS mitigation, and intrusion prevention systems (IPS) safeguard against cyber threats. With a DevSecOps approach, security is integrated into every stage of development and deployment.

Compliance you can trust
Exclaimer complies with top industry standards, including SOC 2 Type II, ISO/IEC 27001, HIPPA, GDPR, CCPA, and Cyber Essentials. Regular and extensive independent audits make Exclaimer the most secure Microsoft 365 (Office 365) signature management solution available.


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Market-leading email signature software for Microsoft 365

Over 65,000 companies automate email signature updates with Exclaimer, including:

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Customer-stories

How CIS Security influenced £6.1 million in revenue with Exclaimer

Centralizing email signature management to enhance branding, security, and marketing impact.

Read more
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Customer-stories

How Denholm Good Logistics saved 40+ hours monthly with Exclaimer

Enhancing IT efficiency, brand consistency, and marketing opportunities across a growing global enterprise.

Read more
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Customer-stories

How Bloomerang achieved 100% brand consistency in 15 minutes with Exclaimer

Unifying email signature management for enhanced IT efficiency and marketing impact.

Read more
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Customer-stories

How CIS Security influenced £6.1 million in revenue with Exclaimer

Centralizing email signature management to enhance branding, security, and marketing impact.

Read more
Image Placeholder
Customer-stories

How Denholm Good Logistics saved 40+ hours monthly with Exclaimer

Enhancing IT efficiency, brand consistency, and marketing opportunities across a growing global enterprise.

Read more
Image Placeholder
Customer-stories

How Bloomerang achieved 100% brand consistency in 15 minutes with Exclaimer

Unifying email signature management for enhanced IT efficiency and marketing impact.

Read more

How much could you save?

Total annual cost of email signature changes to your business

$ 0

Annual cost of Exclaimer (volume discounts available)

$ 0

ROI

0 %

Try our email signature solution for Microsoft 365

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FAQs

Your frequently asked questions about Exclaimer for Office 365 answered.

How does Exclaimer integrate with Microsoft 365 to manage email signatures?

Exclaimer integrates with Microsoft 365 using server-side and client-side methods to manage email signatures.

The server-side setup routes emails through Exclaimer’s Azure-hosted service via Microsoft 365 connectors, applying signatures automatically before final delivery.

The client-side option deploys signatures directly into Outlook using an add-in, allowing users to see and select their signatures while composing emails. Exclaimer securely connects to Microsoft 365 via Azure AD, maintaining compliance with data protection standards.

See what our customers say

Discover how organizations save time and stay consistent across Microsoft 365.

“Exclaimer is an outstanding email signature solution. It suits our needs perfectly, and we wouldn’t be able to handle our signatures without it. Exclaimer just makes it all easy.”

Alfred Muller

Dunlop Protective Footwear

“With Exclaimer, we can now force email signature uniformity, and run banner campaigns for different departments. Their customer support is fantastic and I highly recommend their solution.”

Ryan Fannin

Indianapolis Colts

“Whether you want to reinforce your brand, share important news or simply ensure that your contact details are delivered consistently, Exclaimer is the best way to manage the process efficiently.”

Anke Taylor

FloControl Ltd

“We have found the entire signature creation and implementation process incredibly efficient and time saving, while also making overall signature administration much easier.”

Gil Morris

Clements, Purvis & Stewart, P.C.

“Exclaimer is great for marketing because we can use it in so many different ways. We can really understand our recipients in detail and see what content they’re interacting with.”

Victoria Walker

Apple Print & Creative

“Exclaimer has truly made my life easier when it comes to controlling our employees’ email signatures. I’m proud of the way we can now express ourselves over email thanks to this solution.”

Trish Metts

Burris Logistics