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How to Prevent Power Automate AI Builder from Processing Email Signatures

Maira Mehtab Sep 21, 2026 869 views

Question details

The user needs to prevent Power Automate AI Builder from extracting data from the sender's email signature when processing Outlook attachments.

Product: Power Automate
Device & OS: not provided
Scenario: Extracting information from Outlook attachments to create a sales order via an automated flow.
Observed behavior: AI Builder processes the inline email signature images as attachments, which causes the flow to fail during the extraction process.

Before you start

Ensure you have access to your Power Automate flow's editing interface and understand the basic triggers and conditions used for processing Outlook email attachments.

Solution 1Recommended

Filter Out Inline Attachments Using a Condition

Set up a condition in your Power Automate flow to exclude inline images, which are typically used for email signatures.

Email signatures often contain inline images such as company logos. By default, Power Automate may treat these as regular attachments. You can use the 'Is Inline' property to filter them out before passing the files to AI Builder.

Open the flow editor

Add a condition action

Right after your 'When a new email arrives' trigger (or the 'Get Attachment' action), add a 'Condition' control step.

Configure the inline check

Set the condition to check if the attachment property 'Is Inline' is equal to 'false'. This ensures only actual attached documents pass through.

Move AI Builder to the correct branch

Drag your AI Builder data extraction action into the 'If yes' branch of the condition so it only processes valid files and ignores signature images.

Solution 2

Seek Specialized Guidance from the Power Automate Community

If standard filtering does not resolve the issue, consult experts on the official Microsoft forums for advanced AI Builder model tuning.

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Frequently Asked Questions

Why does Power Automate process email signatures as attachments?

Email signatures often contain inline images, such as company logos or social media icons. Power Automate treats these inline images as attachments by default unless they are specifically filtered out using the 'Is Inline' condition.

Can AI Builder be trained to ignore certain parts of a document?

Yes, when creating a custom document processing model in AI Builder, you can define specific fields and tables to extract. This helps the model focus on the necessary data and ignore irrelevant elements like logos or signatures.

How do I check if my Power Automate flow failed due to a signature?

Review the flow's run history. If the AI Builder action fails, check the inputs passed to it. If you see a small image file (often a few kilobytes in size) instead of your expected sales order document, the flow likely attempted to process an email signature logo.

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