Solution : https://service.sap.com/sap/support/notes/107747 (SAP Service marketplace login required)
Key words :
additional key words mime part, send mail call fails, japanese double-byte-characters, internet mail gateway, national special characters, message header extension, encoded-words, message header, 8-bit-characters, handled incorrectly
Related Notes :
| 101573 | Internet Mail Gateway: Versions |