No way. Today I found that an email was rejected by rdns lookup failed. So I went to my SMTP config page and I was going to add to the list "Dont' check" list the domain.ext of this email address but it was already there!
I added the address to the whitelist of the domain but neither this is letting this email in.
I don't know what to do. I had to remove the rdns ceck but I'd like to have it on.