C# yandex mail send error 5.5.4 Error: send AUTH command first

Question

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

Error 5.5.4 Error: send AUTH command first

Here is my code. I try w

Answer 1

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