Troubleshoot Incoming Email Issue on Exim

I need a Linux expert to help with my CentOS 7.9 AWS EC2 server that's using Exim for email. I'm able to send emails but I'm unable to receive them. It seems like there are error messages in my Exim logs, but I'm not sure how to interpret them or what the issue is.

Key Requirements:
- Troubleshoot Exim logs to identify issues
- Ensure proper configuration of MX and SPF records
- Provide a solution to receive emails

Ideal Skills:
- Extensive experience with Linux
- Proficient in Exim and CentOS
- Strong understanding of email protocols and DNS configuration
- AWS SES knowledge would be beneficial