MailTool/MailFromWho/Settings.cs

public class Settings
{
    public string UserName { get; set; } = String.Empty;
    public string ImapServer { get; set; } = String.Empty;
    public int SslPort { get; set; }
    public string IntermediateFile { get; set; } = String.Empty;
    public string CsvFile { get; set; } = String.Empty;
}