SPF policies do not automatically get inherited by subdomains. If you use SPF to authenticate your emails and you are sending emails using subdomains, you would need to set up SPF for subdomains
Domain owners can configure multiple domains to make use of a single SPF record hosted on one domain using SPF redirect. While it may seem to be beneficial in some ways, we don’t recommend it.
Cyber resilience builds on the baseline of good cyber security practices by addressing businesses' ability to withstand, recover and counter cyber threats. Make DMARC a part of your company’s cyber resilience framework.
Most mailbox providers in recent times read the SPF -all and ~all mechanisms as "NOT PASS". This was not the case before DMARC and is still not the case for a handful of providers.
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