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Salesforce Outlook Integration Error: 'Your email was related, but truncated for size' - 32KB Limit

게시 일자: Mar 5, 2026
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The email body size limit in Salesforce is 32Kb and Inbox truncates email at this limit and display the message "Your email was related, but truncated for size." 

If you see this message while using Inbox with Outlook and the email message appears to be less than the 32KB limit, then document formatting XML in the email message could be increasing the HTML body size to over 32KB.

To check the email message HTML body content for document formatting XML:
  1. View the truncated email message record in Salesforce and take note of the record ID
  2. Use this following query in Workbench to see the value saved into the HTML body field of the email message Select ID, HTMLBody from EmailMessage where ID='EmailMessageID' 
  3. Review the HTMLbody value document formatting XML, for example:
<w:LsdException Locked=3D"false" Priority=3D"0" QFormat=3D"true" Name=3D"Normal"/>
<w:LsdException Locked=3D"false" Priority=3D"9" QFormat=3D"true" Name=3D"heading 1"/>
<w:LsdException Locked=3D"false" Priority=3D"9" SemiHidden=3D"true" UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"heading 2"/>
<w:LsdException Locked=3D"false" Priority=3D"9" SemiHidden=3D"true" UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"heading 3"/>
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Enabling the Outlook setting "Reduce message size by removing format information not necessary to display the image" will remove the XML from future email and reduce the HTML body size and
allow Inbox to add email without truncation.

In Outlook 

  1. Open the Outlook mail settings: File | Options | Mail
  2. Scroll down to the Message format settings
  3. Enable the setting Reduce message size by removing format information not necessary to display the image

All the details are described perfectly but just to make a note of the setting 'Reduce message size by removing format information not necessary to display the image' might cause <style> block to be removed on replies and forwards.

Note:
When an HTML email uses a <style> tag with CSS rules, the Outlook setting to "reduce message size by removing formatting" will cause that <style> block to be removed on replies and forwards which may affect the recipient experience.

You can also make a request to Support to increase the Email Body character limit from 32K characters to 131K characters for your org. 
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