Can't receive Email send from AWS Simple Email Service

I am now using AWS Simple Email Service, and I have already verity the two of my own domains.

However, on January 24, I switched from a .net domain to an .im domain, and then I had the problem described below. I also set up my own post office through Mailu, using the .im domain I purchased a few days ago. However, I find that I cannot receive emails from AWS Simple Email Service, and it seems to be a hard bounce according to the AWS SES Dashboard. But I have added the relevant DNS records according to Mailu's prompts, and I am receiving notification emails from AWS and other service providers, I just can't receive them from the AWS SES automated program, which seems odd.This problem only occurs when sending from AWS SES with an incoming email suffix of the .im domain I purchased a few days ago, emails sent to others via AWS SES seem to be working fine.

I also sent a Ticket yesterday asking if I had received a restriction on this service for my account. However, AWS replied that I was not restricted and they recommended that I escalate the work order to a technical work order or ask the community for help.

Maybe I should update my DNS record? How can I solved this problem, and thanks for Community's help.