OK, so I was trying to set up SES one day, and I tried to add an MX record for the "mail" subdomain. However, it prompted that I do not have access to the domain, so I added a new "mail" subdomain to my website. I removed the subdomain shortly after I added the MX record, and everything worked fine. However, when I tried to delete that record today, it kept saying "No specific error was returned with the failed API call". I thought I might have to add the subdomain again, but I couldn't as there is an existing DNS record. Any ideas on how to remove that entry?