CSA Header

The header will be added at the beginning of the mail so that it will not parse the complete mime structure to find entry points and potentially corrupt the structure.

{
  ....
    "csaFeature": {
    "complaintsHeader": "X-CSA-Complaints: whitelistcomplaints@eco.de", "listUnsubscribeMandatory": false,
    "active": true, "settingsRelevant": false
  }
  ....
}