Solution : https://service.sap.com/sap/support/notes/1236848 (SAP Service marketplace login required)
Key words :
symptom workflow email sending gibberish, - job id- job, total subject length, email subject, mdm server, irrelevant data, expiration timeout, concatenated entities, truncated automatically, exceed 75 characters
Related Notes :
1642357 | MDM Workflow notification step sends garbled emails |