C#yandex邮件发送错误5.5.4错误:首先发送AUTH命令 [英] C# yandex mail send error 5.5.4 Error: send AUTH command first

问题描述

我尝试使用C#和yandex发送邮件，但出现错误:

I try to send mail using C# and yandex, but I get an error:

错误5.5.4错误:首先发送AUTH命令

Error 5.5.4 Error: send AUTH command first

这是我的代码.我尝试使用不同的端口(587、465 ..)和SMTP主机(smtp.yandex.com.tr，smtp.yandex.com，smtp.yandex.ru ...)，但在所有尝试中都遇到相同的错误./p>

Here is my code. I try with different ports (587, 465..) and SMTP hosts (smtp.yandex.com.tr, smtp.yandex.com, smtp.yandex.ru...) but I get the same error for all attempts.

SmtpClient sc = new SmtpClient("smtp.yandex.com.tr", 587);
//sc.Port = 587;
//sc.Host = "smtp.yandex.com";

sc.EnableSsl = false;
sc.Credentials = new System.Net.NetworkCredential(System.Configuration.ConfigurationManager.AppSettings["Email"].ToString(), 
                                                  System.Configuration.ConfigurationManager.AppSettings["Sifre"].ToString());
sc.UseDefaultCredentials = false;
sc.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;

推荐答案

在没有SSL的情况下，Yandex Mail不支持连接(根据 https://yandex.com/support/mail/mail-clients.xml ).尝试将EnableSsl设置为true并使用主机:smtp.yandex.com，端口:465.如果不起作用，请尝试端口25

Yandex Mail doesn't support connection without SSL (according to https://yandex.com/support/mail/mail-clients.xml). Try to set EnableSsl to true and use host: smtp.yandex.com, port: 465. If it will not work - try port 25

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