530 5.7.1 Authentication required - AUTH

Authentication with command AUTH is required. Use AUTH command (SMTP Server requires authentication).

SMTP Authentication - This is enabled by default and requires a valid User/Password to be used before SMTP sending is allowed.You should ensure your e-mail client is set to authenticate it's SMTP connection.

Links:

How to set up and use mail services with SMTP Authentication

Applies To

SMTP Error Codes

See Also