How to Troubleshoot Problems Sending or Receiving PDF Emails in Outlook
Question details
Users are experiencing inconsistencies or failures when attempting to send or receive PDF files as email attachments via Outlook, mobile devices, or work email servers.

- Product
- Outlook/PDF
- Device & OS
- not provided
- Scenario
- Attempting to send or receive a PDF file via an email client.
- Observed behavior
- PDF attachments fail to send or be received, sometimes accompanied by bounce-back error messages or silent failures due to server restrictions.
Ensure your internet connection is stable and check if your email server is experiencing any temporary outages before attempting further troubleshooting steps.
Identify the Root Cause by Documenting the Workflow
Gather details about the failing email to determine if the issue is with the file, the email client, or server restrictions.
Email delivery failures can stem from various sources, including the email application itself, mail server restrictions, attachment size limits, or even a corrupted PDF. By systematically checking each variable, you can quickly identify the actual bottleneck.
Right-click the PDF file, select 'Properties', and check its size. Ensure it does not exceed your email provider's attachment limit (typically 20MB to 25MB for most standard providers).
Check your inbox for any Non-Delivery Report (NDR) or bounce-back messages. Capture a screenshot or note the exact error code, which often explains if the inbox is full or the file is too large.
Try sending the same PDF using a different device (like your mobile phone) or a different platform, such as a webmail interface instead of the Outlook desktop app.

Compress the PDF Before Sending
Large PDF files are often blocked by email servers. Compressing the file can resolve send/receive issues related to size limits.
Easily Compress and Send PDFs with WPS Office
WPS Office provides a comprehensive PDF toolkit that allows you to read, edit, compress, and directly share PDF files via email without worrying about file size limits.
- 1. Open the PDF in WPS Office: Launch WPS Office and open the PDF document you wish to send.
- 2. Compress the file: Go to the 'Tools' tab and click 'Compress' to easily reduce the file size if it exceeds standard email limits.
- 3. Share via Email: Click the 'Share' or 'Email' button directly within the application to automatically attach the optimized PDF to your default email client.

Frequently Asked Questions
Why am I receiving a bounce-back email when attaching a PDF?
Bounce-back emails usually occur if the PDF exceeds the recipient's mail server size limit, if their inbox is completely full, or if a typo was made in the email address.
Does Outlook block certain PDF files for security reasons?
Outlook generally allows standard PDF attachments. However, if the PDF contains malicious scripts or is flagged as a threat by your antivirus software, the email client or server may block it.
How can I send a PDF if it is still too large for email after compression?
If the file remains too large, upload the PDF to a cloud storage service (like Google Drive, OneDrive, or Dropbox) and paste the shared download link into the body of your email.




