Solution : https://service.sap.com/sap/support/notes/1045882 (SAP Service marketplace login required)
Key words :
menu option utilities->mime settings, exist choose message class->save, existing mime versions disappear, information message 'mime version, message class xs, save mime versions, message short text, mime version exists, call transaction se91, relevant support package
Related Notes :
| 953694 | Displaying incoming send requests |
| 845449 |