可收取选中的邮件账号邮件，也可收取新邮件账号的邮件。当选中指定的邮件账号收取邮件时，会提示相关的服务器地址、用户名和密码。
OpenPOP.POP3.Utility.Log = true;
popClient.Connect(POPServer, int.Parse(port));
popClient.Authenticate(login, password);
count = popClient.GetMessageCount();
public void receiveMail(int beginIndex, int endIndex)
for (int i = beginIndex; i <= endIndex; i++)
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