Under some circumstances when you apply to Comcast for a new feedback loop (FBL) or request modifications to an existing FBL, Comcast may:
- Keep the request in a pending status for a long time
- Disallow re-submission of the request until it is denied by Return Path
Comcast may delay approval of a new FBL or a modification request if:
- The submission was made using ranges greater than /32 Classless Inter-Domain Routing (CIDR)
- The IP addresses do not have a proper reverse Domain Name System (rDNS) set-up
Data needed to troubleshoot
- The IP address
- The FBL email address
- The confirmation email address
To resolve the delay:
- Check the rDNS record entry of the IP address at the IP check for Mailservers website to make sure you have a fully qualified rDNS entry.
If necessary, correct the rDNS record.
- Open a support ticket with Return Path.
Return Path reviews:
- The rDNS entry
- The IP address range from the original FBL request
- Both are correct, Return Path approves the FBL request.
- The original request was for ranges greater than /32 CIDR, Return Path denies the original request and asks you to resubmit it using the appropriate range.