Showing invaild domain as error message

The error message is - "Unable to send message;Reason:553 Relaying dissolved. Invalid Domain - mohammed.musadiq@yespired.net

Hi

I understand that you are getting an invalid domain error, when you send out emails from your account after you have changed your servername.Please correct me if my understanding is wrong.This could due to the incomplete DNS validation.

To set up the DNS validation in the console these are the steps: Step 1:

• Open the ACM console on this link : https://console.aws.amazon.com/acm/

Step 2:

• In the list of certificates, choose the Certificate ID of the cerificates with status Pending validation that you want to configure.

Step 3:

• In the Domains section, complete one of the following two OPTIONAL procedures:

  1.Validate with Route 53
         An active Create records in Route 53 button appears if the following conditions are true:
        - You use Route 53 as your DNS provider. 
        -  You have permission to write to the zone hosted by Route 53.
        - Your FQDN has not already been validated.
  

Choose the Create records in Route 53 button, then choose Create records. The Certificate status page should open with a status banner reporting Successfully created DNS records. Your new certificate might continue to display a status of Pending validation for up to 30 minutes.

OR

1. If you are not using Route 53 as your DNS provider, you must retrieve the CNAME information and add it your DNS database. You can do this in either of two ways:

• Copy the CNAME components displayed in the Domains section. This information needs to be added manually to your DNS database.
• Alternatively, choose Export to CSV. The information in the resulting file needs to be added manually to your DNS database.

If ACM is not able to validate the domain name within 72 hours from the time it generates a CNAME value for you, ACM changes the certificate status to Validation timed out. For further assistance contact AWS customer support.

You can refer to the following documents on troubleshooting issues:

https://docs.aws.amazon.com/acm/latest/userguide/dns-validation.html