Fix for cc and bcc and return messageid

[eppinger]

• Fix for cc and bcc at the wrong place (by myself) and the ability to set multiple cc and bcc recipients
• return the x-message-id for further processing

[eppinger]

sorry for the cc/bcc error and thanks for your great work

[elpete]

@eppinger I did a bit of cleanup. Can you test it still works like you want before I merge it?

[eppinger]

@elpete

works like a charm and looks cleaner.

Thanks