Problem :
Message size exceeds server error
Solusi :
Bisa di naikan message_size_limit nya biasanya default 50 MB,
Login to WHM as root >> Under Service Configuration, Click “exim Configuration Manager” >> Click “Advanced Editor”
Scroll down and Click “Add additional Configuration Setting” >> Find “message_size_limit” in pull-down list and choose
Enter limit that you want to change to >> Scroll to bottom and click “save”