fixed sender address handling
fixed sender address handling

now responses for calendar events are handled gracefully

Change-Id: I2182a5c5d317fc60841ae1088c260a6db519a45d
Signed-off-by: Falko Zurell <553d907fcdd96929d5363dc3b6e443669c7e54a8@zurell.de>

maxheadroom/helpers,maxheadroom/helpers,maxheadroom/helpers