The error message "550 Access denied - Invalid HELO name" means that the server you are trying to connect to is refusing your request because the HELO name you sent is not valid. The HELO name is a hostname that is sent by a mail server to identify itself to another mail server. It is important that the HELO name be valid because it helps to prevent spam and other malicious activity.
There are a few reasons why the HELO name you sent might be invalid. One possibility is that you simply made a typo in the hostname. Another possibility is that the hostname does not exist. Finally, it is also possible that the hostname is not authorized to send mail from your IP address.
If you are getting this error message, you can try the following:
- Check the hostname you are using to make sure it is spelled correctly.
- Verify that the hostname exists.
- Check with your ISP to see if your IP address is authorized to send mail from the hostname you are using.
- The error code 550 is a standard error code used by many different servers.
- The error message "Invalid HELO name" is a specific message that indicates that the HELO name you sent is not valid.
- The specific reason for the HELO name being invalid will vary depending on the server and the hostname you are using.
If you have checked all of these things and you are still getting the error message, then you may need to contact Ultra Web Hosting for help.