public void Execute()
{
List <Mail> mailList = new List <Mail>();
foreach (KeyValuePair <int, MailProvider> item in MailProvider.Providers)
{
int standByPeriod = 1;
MailProvider provider = item.Value;
if (provider.StandbyPeriod > standByPeriod)
{
standByPeriod = provider.StandbyPeriod;
}
SendMailList(MailQueue.Fetch(provider));
Thread.Sleep(standByPeriod * 1000);
}
mailList.AddRange(MailQueue.Fetch());
SendMailList(mailList);
mailList.AddRange(MailQueue.Fetch());
}