Why is an email not delivered, saying, recipient address in single label domain not accepted. Also says "mailbox undergoing maintenance!"

Thank you for contacting our support my name is Jane regarding the issue you are experiencing with email delivery.

The error message you received, "recipient address in single label domain not accepted" indicates that the email address you are trying to send to is not formatted correctly. A single label domain is a domain name that consists of a single word without a top-level domain (TLD) such as .com or .net.
In addition, the message "mailbox undergoing maintenance" means that the recipient's mailbox is currently unavailable due to maintenance or updates being performed on their email service provider's servers.

To resolve this issue, we suggest contacting the recipient to confirm that their email address is correctly formatted and to check with their email service provider to confirm if they are performing any maintenance on their servers.

We apologize for any inconvenience this may have caused and appreciate your patience while we work to resolve this issue.
Please feel free to contact me if you have any further questions or concerns.

Best regards,
JANE

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