Attachment Issues

How to Fix Missing Exchange Signature Images in Emails

Muhammad Talha Oct 10, 2026 869 views

Question details

Users are experiencing an issue where email signature images fail to display intermittently in Microsoft Exchange.

How to Troubleshoot Missing Exchange Signature Images

Product: Microsoft Exchange
Device & OS: not provided
Scenario: Sending or receiving emails with image-based signatures where the image intermittently disappears or is replaced by text.
Observed behavior: Signature images are intermittently missing from message content, sometimes leaving replacement text that Exchange rules cannot automatically remove.

Before you start

Before troubleshooting, gather 2 to 3 recent examples of emails where the signature failed to load, and note the sender, recipient, timestamp, and the specific email client used.

Solution 1Recommended

Verify Image Embedding and Security Settings

Rule out incorrect embedding methods, firewall blocks, or security filters that might intermittently strip image attachments.

Missing signatures are often caused by strict security policies or incorrect image embedding rather than the Exchange server itself. Consistently blocked images usually indicate a policy issue, while intermittent issues point to network or client-side anomalies.

Check the embedding method

Verify whether the signature images were uploaded directly into the email client (inline) or linked via an external URL. Inline embedding is generally more reliable for bypassing external image blocks.

Investigate security policies

Review your antivirus and firewall logs. Temporarily disable strict email scanning on the client side to see if images stop being stripped during transport.

Check recipient client behavior

Confirm with the recipient if their email client is set to automatically download pictures. Many clients, including Outlook, block automatic image downloads from unknown senders by default.

Verify Image Embedding and Security Settings

Note on Exchange Rules: Exchange mail flow rules generally cannot reliably edit arbitrary portions of message content or selectively remove text that replaces a missing image.

Solution 2

Escalate to Microsoft 365 Support

If network, firewall, and client configurations are correct but the issue persists, request a deeper service-level diagnosis.

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Frequently Asked Questions

Why do signature images show up as attachments instead of inline?

This typically occurs when the recipient's email client does not fully support HTML inline rendering, or if the image was not properly embedded using the Content-ID (CID) method, causing the email client to treat it as a standard file attachment.

Can Exchange mail flow rules automatically fix broken signature images?

No. While Exchange mail flow rules can detect specific conditions and apply actions like routing or appending disclaimers, they cannot reliably parse and edit arbitrary portions of message content to fix or cleanly remove a broken image.

Does the recipient's email application affect how signatures appear?

Yes. Most modern email applications have built-in privacy settings that block automatic image downloads. The recipient usually needs to manually click 'Download Pictures' or add the sender to their safe senders list to view the images.

How do I perform a message trace for dropped attachments in Microsoft 365?

Administrators can log into the Exchange admin center, navigate to Mail flow > Message trace, and enter the sender and recipient email addresses to track the delivery status and see if transport rules impacted the message.

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