MailTool/MailFromWho/appsettings.json

{
  "Settings": {
    "UserName": "someone@freedom.nl",
    "ImapServer": "imap.freedom.nl",
    "SslPort": "993",
    "IntermediateFile": "AllFromAddresses.txt",
    "CsvFile": "Adressen.csv"
  }
}