What's Causing This Error
It is difficult to diagnose the cause of the 458 error code without having additional error information. However, if your SMTP server fails to queue messages for the node, you will run into this error.
Solution - Here's How To Resolve It
You can try one of the following to see if it helps resolve the error.
- Firstly, check the firewall settings on the SMTP server and verify that outgoing connections are not blocked.
- Secondly, review the SMTP settings and ensure you use the correct port and authentication protocol.
- Thirdly, use another SMTP server and see if the issue persists. If so, the problem might be from your local computer. Therefore, try disabling the anti-virus guard and retrying.