Although there is no harm in using multiple email services, it’s always better to merge SPF records to keep using different email services without any errors and deliverability issues.
Meta: While DMARC protects you from a wide range of cyberattacks, it is no silver bullet. Here is a full list of which attacks does DMARC not protect you from!
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.
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