public string[] GetDistinctEmails()
{
var list = new List <string>();
if (To != null && To.Count() > 0)
{
list.AddRange(To);
}
if (Cc != null && Cc.Count() > 0)
{
list.AddRange(Cc);
}
if (Bcc != null && Bcc.Count() > 0)
{
list.AddRange(Bcc);
}
var result = list.Distinct().ToArray();
return(result);
}