Managed DKIM/SPF services and Postal DNS Checker

Describe the bug

Not sure a bug, but maybe needs extra code to check DKIM and SPF for managed services. I use RedSift OnDMARC services to manage my DKIM, DMARC and SPF records with Dynamic services. In this example, my SPF record is "v=spf1 include:_u.DOMAINNAME._spf.smart.ondmarc.com ~all" and all the "Include" mechanisms are fed from that SPF record from OnDMARC. Same with DKIM. My DNS record for my domain is _domainkey.DOMAINNAME | NS |  ns-dkim.ondmarc.com and all my DKIM entries are managed in OnDMARC portal e.g. - postal-ditccq | TXT | v=DKIM1; t=s; h=sha256; p=MIGfMA0GCS..... I get Warning An SPF record exists but it doesn't include spf.mailer.POSTALSERVER.co.uk and Warning No TXT records were returned for postal-dITCcQ._domainkey.DOMAIN

Running a DKIM checker on MXToolbox reveals he correct DKIM key - DOMAIN:postal-dITCcQ

Expected behaviour

It'd be clever if the Postal DNS checker followed SPF and DKIM records to check for existence of the real records