using (var client = new MailKit.Net.Smtp.SmtpClient(new ProtocolLogger(Program.CreateMailLog())))
                //25 587
                // String HOST = "email-smtp.us-west-2.amazonaws.com";
                // int PORT = 587;
                client.Connect(HOST, PORT, SecureSocketOptions.StartTlsWhenAvailable);
                //SMTP_USERNAME: Replace smtp_username with your Amazon SES SMTP user name.
                // SMTP_PASSWORD: Replace smtp_password with your Amazon SES SMTP user name.
                client.Authenticate(SMTP_USERNAME, SMTP_PASSWORD);
                // client.Authenticate(oauth);
                client.Send(message);
                client.Disconnect(true);
but is error.

logs:
Connected to smtp://email-smtp.us-west-2.amazonaws.com:587/?starttls=when-available
S: 220 email-smtp.amazonaws.com ESMTP SimpleEmailService-d-B1D75AM90 83qp4IzaerfvF0CNuJJJ
C: EHLO [192.168.1.110]
S: 250-email-smtp.amazonaws.com
S: 250-8BITMIME
S: 250-SIZE 10485760
S: 250-STARTTLS
S: 250-AUTH PLAIN LOGIN
S: 250 Ok
C: STARTTLS
S: 220 Ready to start TLS
C: EHLO [192.168.1.110]
S: 250-email-smtp.amazonaws.com
S: 250-8BITMIME
S: 250-SIZE 10485760
S: 250-STARTTLS
S: 250-AUTH PLAIN LOGIN
S: 250 Ok
C: AUTH PLAIN XXX
S: 235 Authentication successful.
C: MAIL FROM:<myemailname> SIZE=606
S: 501 Invalid MAIL FROM address provided
C: RSET
S: 250 Ok
logs say my error is 501 Invalid MAIL FROM address provided

but i don't know what can i do

someone has idea of it

Best wish