Method 1: Exchange Transport Rules (Disclaimers)
The most common method for Exchange/Office 365 signature deployment:
- Log in to Exchange Admin Centre (admin.exchange.microsoft.com)
- Go to Mail flow → Rules
- Click + Add a rule → Apply disclaimers
- Name the rule (e.g., "Company Signature")
- Set condition: Apply to all messages sent outside the organisation
- In the disclaimer HTML, paste your signature template
- Use Active Directory variables for personalisation:
%%DisplayName%%,%%Title%%,%%PhoneNumber%% - Set fallback action and save
Available AD Variables
%%DisplayName%%
Full name
%%FirstName%%
First name
%%LastName%%
Last name
%%Title%%
Job title
%%Department%%
Department
%%PhoneNumber%%
Phone
%%MobileNumber%%
Mobile
%%Email%%
Email address
%%Company%%
Company name
%%Office%%
Office location
Transport Rule Limitations
✅ Advantages
- Centralised management
- Automatic personalisation via AD
- Users can't modify or remove
- Applied server-side
⚠️ Limitations
- Limited HTML/CSS support
- Images must be externally hosted
- User can't preview before sending
- Applied after encryption
Method 2: Registry/GPO Deployment (Outlook Desktop)
For on-premise Outlook desktop clients:
- Create HTML signature files for each user
- Deploy via GPO to
%appdata%\Microsoft\Signatures\ - Set registry keys to configure default signature
- Users see the signature in their Outlook immediately
🏢 Enterprise support: We provide Exchange-ready HTML signature templates with AD variable placeholders. Contact us for enterprise deployment assistance.