private List <int> GetMailIndex(IMailClient client, string searchCriteria, string mailbox)
{
IEnumerable <int> strMsgIds = null;
string mailIndexs = string.Empty;
if (string.IsNullOrWhiteSpace(searchCriteria))
{
mailIndexs = client.GetAllMessagesFlag(out strMsgIds, mailbox);
}
else
{
mailIndexs = client.SearchMail(searchCriteria, out strMsgIds, mailbox);
}
return(strMsgIds.ToList());
}