Email Signature Issues

Ambient manages email signatures by injecting them into Outlook’s signature registry on the endpoint. If signatures aren’t appearing, work through these steps.

Step 1: Confirm Signature Template Is Published

In Command Center → Content → Signatures, check that the signature template status is Published. Draft signatures are not deployed to endpoints.

Step 2: Confirm Campaign Is Active

The signature must be linked to an active campaign targeting the affected user. Check Campaigns for an active Signature campaign targeting the user’s group.

Step 3: Check Agent Signature Application

The agent applies signatures after each policy sync (every 60 seconds). Confirm the agent is online (see Agent Showing Offline).

To force immediate re-application: Command Center → Insights → Endpoint Intelligence → [Device] → Actions → Apply Signatures Now.

Step 4: Verify Outlook Configuration

Outlook must be configured to use Ambient-managed signatures:

Outlook (Microsoft 365 / 2019+):

1. Go to File → Options → Mail → Signatures.
2. Confirm the Ambient signature appears in the list.
3. Set it as the default for New messages and/or Replies/Forwards.

If Outlook is not showing the signature, the registry write may have failed.

Check registry:

# Run in PowerShell as the affected user
Get-ItemProperty "HKCU:\Software\Microsoft\Office\16.0\Common\MailSettings" | Select-Object NewSignature, ReplySignature

If these keys are missing, the agent hasn’t written them. Check the agent log:

C:\ProgramData\Ambient\logs\agent.log

Search for signature to find relevant error messages.

Step 5: Template Rendering Issues

If the signature appears but looks broken (missing images, wrong fonts):

• Images not loading: Ensure the signature image URLs are publicly accessible (not behind auth).
• Font not rendering: Use web-safe fonts (Arial, Calibri, Georgia) for maximum Outlook compatibility. Custom fonts are not reliably supported in Outlook.
• HTML rendering: Outlook uses Word as its HTML renderer and strips many CSS properties. Avoid: flexbox, CSS grid, border-radius on images, box-shadow.

Use the Preview in Outlook button in the signature editor to test rendering before publishing.

Step 6: Outlook New Outlook (Web-based)

The “New Outlook” experience (2024+) uses a different signature mechanism. Ambient supports New Outlook signature injection from agent v1.0.85+. Ensure devices are running the latest agent.

Still Having Issues?

Submit a ticket from Help & Support → Submit Ticket and include:

• The affected user’s email address and device name
• The signature template name
• A screenshot of the signature in Outlook (or the error if visible)
• C:\ProgramData\Ambient\logs\agent.log