I'm having an issue with our Coldfusion server sending emails to our PMG that's just acting as a relay. The error is "Recipient address rejected: Service is unavailable (try later)". I have read in the forums that this is due to Greylisting IPv4 being enabled. I disabled the greylisting and tried again getting the same error. I can resend the email immediately and it'll go through fine. So now I'm stumped since I though disabling Greylisting was the fix. Does anyone have another suggestion? Thanks!