[#9] Handle headers for Mails from Egroups
- Checks if List-ID and Delivered-To headers are present, in case it's an egroup.
- If present then use Delivered-To as To content, because egroups have set to: egroup-email instead or recipient email.
- Add List-Id to the published message so that egroups permissions can be managed later.
Closes #9 (closed)
Edited by Emmanuel Ormancey