How to Fix Cannot Send Stamped PDF as Outlook Attachment in Adobe Acrobat
Question details
The user is unable to send a PDF document as an Outlook email attachment directly from Acrobat after applying a custom stamp to the file.

- Product
- Adobe Acrobat and Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Attempting to use the Send as Attachment command in Acrobat after opening a PDF from Outlook and inserting a custom stamp.
- Observed behavior
- Adobe Acrobat stops responding or freezes, preventing the stamped PDF from being sent as an Outlook attachment.
Ensure your modifications on the stamped PDF are saved locally to your computer before attempting any application repairs or restarts to prevent data loss.
Update and Repair Adobe Acrobat
Running updates and the built-in repair tool can fix corrupted application files or compatibility glitches causing the software to hang.
Outdated software versions frequently cause communication errors between Adobe Acrobat and Microsoft Outlook. Updating and running a repair ensures all plugin components function properly.
Open Adobe Acrobat, navigate to the 'Help' menu at the top, and select 'Check for Updates'. Follow the prompts to install the latest patches.
Go to the 'Help' menu again and click on 'Repair Installation'. Allow the process to complete to fix any underlying software issues.
Reboot your computer to apply the application changes and test the 'Send as Attachment' feature with a stamped PDF.

Reconfigure Default Email Accounts in Acrobat
Removing and re-adding the default email account in Acrobat preferences can resolve communication errors with the Outlook client.
Easily Add Stamps and Email PDFs with WPS Office
Avoid application freezes by using WPS Office to manage, stamp, and share your PDF documents. WPS Office provides built-in PDF tools to annotate and email files directly, bypassing complex plugin conflicts.
- 1. Open PDF in WPS Office: Launch WPS Office and open the PDF document you need to modify.
- 2. Insert Custom Stamps: Navigate to the 'Comment' tab, click 'Stamp', and select or create your custom stamp to place on the document.
- 3. Share via Email: Click the 'Menu' button, select 'Share', and choose 'Email' to open your default email client with the stamped PDF attached.

Frequently Asked Questions
Why does Acrobat stop responding when sending a stamped PDF?
This issue usually occurs due to a communication glitch between Adobe Acrobat and Microsoft Outlook, often triggered by corrupted application preferences, outdated software versions, or conflicting email account settings.
How do I ensure Microsoft Outlook is my default email client?
In Windows, go to Settings > Apps > Default apps, search for 'Email', and select Microsoft Outlook as the default application. This ensures PDF software routes email commands correctly.
Will resetting Acrobat preferences delete my custom stamps?
Resetting preferences to default may remove custom configurations. It is highly recommended to back up your custom stamps folder (usually located in the Acrobat AppData directory) before performing a full reset.
What should I do if repairing the installation doesn't work?
If the repair tool fails, try completely uninstalling Adobe Acrobat, restarting your PC, and downloading the latest version from the official Adobe website for a fresh installation. If requested by support, prepare to provide your Acrobat, Outlook, and OS version numbers.




