Software⏱️ 3 min read📅 2026-06-19

How to Fix: Why does Outlook receive a Content Unacceptable error on send?

Outlook Content Unacceptable error fix for Windows 7 with Outlook 2010 SP2 and Jerseymail POP3 setup.

Quick Answer: Check the email content for any unusual characters or formatting, and try deleting and re-sending the email to resolve the issue.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The user is experiencing an issue with Outlook 2010 SP2 on Windows 7, where emails sent through a JerseyMail POP3 setup receive a Content Unacceptable error upon sending. This error causes the email to bounce back immediately, affecting only certain recipients. The problem started suddenly and has been observed with different email content, but not all recipients are affected equally.

This issue can be frustrating for users who rely on reliable email communication. In this troubleshooting guide, we will explore possible reasons behind this error and provide step-by-step solutions to resolve the issue.

⚠️ Common Causes

  • The Content Unacceptable error in Outlook is often caused by spam filters or content scanners that flag emails with suspicious or unwanted content. This can be due to various factors such as attachments, links, or specific keywords in the email body.
  • Another possible reason for this issue could be a misconfiguration of the JerseyMail POP3 settings, which may lead to incorrect email formatting or encoding.

🔧 Proven Troubleshooting Steps

Configuring Outlook's Junk Email Filter

  1. Step 1: Step 1: Open Outlook 2010 SP2 and go to the Home tab. Click on 'Junk' in the Move group, then select 'Manage Junk E-mail'.
  2. Step 2: Step 2: In the Junk E-mail Options window, click on the 'Safe Senders' tab and add the recipient's email address or domain to the list of approved senders.
  3. Step 3: Step 3: Click 'OK' to save changes and test sending an email to the affected recipient.

Adjusting JerseyMail POP3 Settings

  1. Step 1: Step 1: Check the JerseyMail POP3 settings for correct formatting and encoding. Ensure that the Content-Type header is set to 'text/plain' or 'multipart/alternative'.
  2. Step 2: Step 2: Verify that the email body is not too long (typically under 50KB) as excessive content may trigger spam filters.
  3. Step 3: Step 3: Test sending an email with different attachments and links to ensure they are not causing any issues.

💡 Conclusion

To resolve the Content Unacceptable error in Outlook, try configuring the Junk Email Filter or adjusting the JerseyMail POP3 settings. If these steps do not work, further troubleshooting may be necessary. It is recommended to test sending emails with different recipients and content to identify the root cause of the issue.

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