SAP Knowledge Base Article - Public

2774580 - Error "Upload of MIME type application/octet-stream not permitted" when uploading Emails with attachments


  • You are uploading emails with attachments via Outlook Add-In and you get the error "Upload of MIME type application/octet-stream not permitted".
  • The attachments have all a permitted format as per your settings.


SAP Cloud for Customer

Reproducing the Issue

  • When an e-mail is uploaded from the Outlook Add-In that contains specific attachment formats which are accepted by Cloud for Customer, the error is shown.
  • Affected file formats can be MS Office Documents (docx, xlsx, pps), Images (jpg, png, bmp) and others.


  • Some e-mail servers will set the MIME type of non-text attachments to Application/Octet-stream.
  • The MIME is an internet standard that extends the e-mail format to support non-text attachments and other features.
  • As the Application/Octet-Stream MIME type is not accepted by default in Cloud for Customer, it is possible that several different attachment formats will be blocked depending on the configuration of the e-mail.


Change the allowed MIME types for attachments in Cloud for Customer via a Business Configuration Activity:

  1. Go to the Business Configuration Work Center.
  2. Select Overview and click Go to populate the Activities.
  3. Select Allowed MIME Types activity.
  4. Click Change Immediately.
  5. Set the MIME type Application/Octet-Stream as Allowed.


email upload, outlook add-in , KBA , e-mail , LOD-CRM-SC-EML , Email , LOD-CRM-SRP , Service Request Processing , Problem


SAP Cloud for Customer add-ins all versions ; SAP Cloud for Customer core applications all versions