以前，我用我的服务器作为邮件主机，通过我自己的主机发送电子邮件。现在，我用Yandex作为我的邮件服务器。我试图通过Yandex SMTP发送电子邮件。但是，我不能实现它。我得到“操作已超时”每次的消息。我可以发送和接收电子邮件与相同的设置，当我使用雷鸟。因此，这个帐号没有问题。2我很感谢你的指导。3你可以看到我的代码如下：

EmailCredentials credentials = new EmailCredentials();
credentials.Domain = "domain.com";
credentials.SMTPUser = "email@domain.com";
credentials.SMTPPassword = "password";
int SmtpPort = 465;
string SmtpServer = "smtp.yandex.com";

System.Net.Mail.MailAddress sender = new System.Net.Mail.MailAddress(senderMail, senderName, System.Text.Encoding.UTF8);

System.Net.Mail.MailAddress recipient = new System.Net.Mail.MailAddress(recipientEmail, recipientName, System.Text.Encoding.UTF8);

System.Net.Mail.MailMessage email = new System.Net.Mail.MailMessage(sender, recipient);

email.BodyEncoding = System.Text.Encoding.UTF8;
email.SubjectEncoding = System.Text.Encoding.UTF8;

System.Net.Mail.AlternateView plainView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(System.Text.RegularExpressions.Regex.Replace(mailBody, @"<(.|\n)*?>", string.Empty), null, MediaTypeNames.Text.Plain);

System.Net.Mail.AlternateView htmlView =  System.Net.Mail.AlternateView.CreateAlternateViewFromString(mailBody, null, MediaTypeNames.Text.Html);

email.AlternateViews.Clear();
email.AlternateViews.Add(plainView);
email.AlternateViews.Add(htmlView);
email.Subject = mailTitle;

System.Net.Mail.SmtpClient SMTP = new System.Net.Mail.SmtpClient();
SMTP.Host = SmtpServer;
SMTP.Port = SmtpPort;
SMTP.EnableSsl = true;
SMTP.Credentials = new System.Net.NetworkCredential(credentials.SMTPUser, credentials.SMTPPassword);

SMTP.Send(email);