Solution : https://service.sap.com/sap/support/notes/747202 (SAP Service marketplace login required)
Key words : 
imap4 protocol handling, symptom saving, mail items, exception appears, terms javamail, j2ee engine', javamail service, erroneous behaviour, standard delivery, lower versions
Related Notes : 
       
| 656711 | Deploying Java Support Packages with SDM |