Postfix+ autoresponder not working

Hi,

I have configured the postfix mail server in my local server.

I have enabled the autoresponder service in our mail server. I have activated the autoresponder.

While send the mail form gmail to my account email, I am getting below error.

This is the mail system at host mail.anengineering.net

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

david#anengineering.net@autoreply.change-this-to-your.domain.tld: Host
or domain name not found. Name service error for
name=autoreply.change-this-to-your.domain.tld type=A: Host not found

Final-Recipient: rfc822;david#anengineering.net@autoreply.change-this-to-your.domain.tld
Original-Recipient: rfc822;david@anengineering.net
Action: failed
Status: 5.4.4
Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error
for name=autoreply.change-this-to-your.domain.tld type=A: Host not found

---------- Forwarded message ----------

My domain register hosting site, but the A record point to my mail server.

Please advice me on this issue.

David