![Notification Sender 2222 Error with Server response "5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM" — Knowledge Base Notification Sender 2222 Error with Server response "5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM" — Knowledge Base](https://kb.netwrix.com/wp-content/uploads/2020/01/SMTP-Example.png)
Notification Sender 2222 Error with Server response "5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM" — Knowledge Base
![Exchange - SMTP error: 550 5.7.1 Client does not have permissions to send as this sender - SomoIT.net Exchange - SMTP error: 550 5.7.1 Client does not have permissions to send as this sender - SomoIT.net](https://somoit.net/wp-content/uploads/2017/02/Exchange-SMTP-error-550-5.7.1-Client-does-not-have-permissions-to-send-as-this-sender-1.jpg)
Exchange - SMTP error: 550 5.7.1 Client does not have permissions to send as this sender - SomoIT.net
![The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required](http://www.infinetsoft.com/Uploads/20161015043254Allow%20apps%20that%20use%20less%20secure%20sign%20in.png)
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required
TFSJobAgent: Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
![The only true wisdom is in knowing you know nothing.: Mailbox unavailable. The server response was: 5.7.1 Unable to relay sendername The only true wisdom is in knowing you know nothing.: Mailbox unavailable. The server response was: 5.7.1 Unable to relay sendername](http://1.bp.blogspot.com/_3XioEnWdgu0/SaVW6nFnrbI/AAAAAAAADHk/2rjFuV7Xtao/s400/untitled.jpg)
The only true wisdom is in knowing you know nothing.: Mailbox unavailable. The server response was: 5.7.1 Unable to relay sendername
![The SMTP Server Requires A Secure Connection Or The Client Was Not Authenticated. The Server Response Was: 5.7.1 Client Was Not Authenticated The SMTP Server Requires A Secure Connection Or The Client Was Not Authenticated. The Server Response Was: 5.7.1 Client Was Not Authenticated](https://i0.wp.com/spgeeks.devoworx.com/wp-content/uploads/2020/01/The-SMTP-server-requires-a-secure-connection-or-the-client-was-not-authenticated.jpg?resize=661%2C130&ssl=1)
The SMTP Server Requires A Secure Connection Or The Client Was Not Authenticated. The Server Response Was: 5.7.1 Client Was Not Authenticated
![failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL](https://s3.amazonaws.com/higherlogicdownload/NAVUG/UploadedImages/YPxeJoMYSxsR2VYnAbXP_temp.png)