The body of auto-generated mails should be included in the body of the mail sent by schleuder
Currently, if receiving a forwarded auto-generated mail, the body of this mail isn't included in the body of the mail sent by schleuder, but instead it's attached. This means, one needs to open the attachment to be able to tell what the mail was about. We could make this easier, via including the original mail body in the body of the mail sent by schleuder.