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

I had same error and I correct it via doing some setting at mail.yandex.com (in email account)

To fix it; - Enter the mail address (mail.yandex.com) - Settings - Other Email application - Set selected POP3 setting that is all.

Note : I used 587 port and smtp.yandex.com.tr host.

Have a nice day :)