Fix BackendIMAP: Samsung SII SIII replying and forwarding
Fix BackendIMAP: Samsung SII SIII replying and forwarding

fmbiete/Z-Push-contrib,Freeaqingme/Z-Push-contrib,RavenB/Z-Push-contrib,mta59066/Z-Push-contrib,Takika/Z-Push-contrib,Zentyal/Z-Push-contrib