SMTP Error

I mm writing a code in C# to send email through zoho smtp server, here are the settings:

Outgoing Server Name: smtp.zoho.com

Port: 465

Security Type: SSL

Require Authentication: Yes.

I am using my primary email ( admin@mydomainname.com), and I am sure the password is right.

However, the server responds an error. I am sure my code is right. Is there something wrong with my smtp settings?

Thanks,