How To Fix SWF_MAIL004 - System error: Internal mail type &1 not known

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_MAIL - Workflow: Error in Workflow Mail Connection

• Message number: 004

• Message text: System error: Internal mail type &1 not known

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWF_MAIL004 - System error: Internal mail type &1 not known ?

  The SAP error message SWF_MAIL004, which states "System error: Internal mail type &1 not known," typically occurs in the context of workflow or internal mail processing within SAP. This error indicates that the system encountered an unknown or unrecognized internal mail type when trying to send a mail notification or message.
  Cause:
  
  Invalid Mail Type: The mail type specified in the workflow or mail configuration is not defined or recognized by the system.
  Configuration Issues: There may be issues with the configuration of the workflow or mail settings in the SAP system.
  Custom Development: If there are custom developments or enhancements in the workflow, they might be referencing an invalid mail type.
  Transport Issues: If the system has recently undergone a transport of changes, the mail type may not have been included or properly configured.
  
  Solution:
  
  
  Check Mail Type Configuration:
  
  Go to transaction code SWU3 (Automatic Workflow Customizing) and check the settings related to mail types.
  Ensure that the mail type referenced in the error message is correctly defined in the system.
  
  
  
  Review Workflow Definitions:
  
  Use transaction code SWDD (Workflow Builder) to review the workflow definitions that are generating the error.
  Check if the mail type used in the workflow is valid and exists in the system.
  
  
  
  Check for Custom Code:
  
  If there are custom workflows or enhancements, review the code to ensure that it is not referencing an invalid mail type.
  Make necessary adjustments to the custom code to use valid mail types.
  
  
  
  Transport Requests:
  
  If the issue arose after a transport, verify that all necessary objects related to the mail type were included in the transport request.
  If needed, re-transport the missing objects or manually create the mail type in the target system.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional guidance.
  
  
  
  System Logs:
  
  Review system logs (transaction SLG1) for any additional error messages or warnings that might provide more context about the issue.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SWU3: Automatic Workflow Customizing
  SWDD: Workflow Builder
  SLG1: Application Log
  
  
  
  SAP Documentation: Refer to the official SAP documentation for workflows and mail configuration for more detailed guidance.
  
  
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  
  By following these steps, you should be able to identify the cause of the SWF_MAIL004 error and implement a solution to resolve it.